Schumacher Sc 7500a User Manual

OWNER’S MANUAL  
Model SC-7500A  
For 6 and 12-Volt Batteries  
SpeedCharge  
computer  
smart  
a m p  
a m p  
E N G I N E  
S T A R T  
S
L
O
W
75  
2
C H A R G E  
a m p  
F
A
S
T
  
12 30  
C H A R G E  
Fully Automatic  
Microprocessor Controlled  
Battery Charger with  
Engine Starter  
CAUTION:  
Read all Safety Rules and Operating Instructions,  
and follow them with each use of this product.  
Schumacher Electric Corporation  
Mount Prospect, IL 60056 U.S.A.  
Send Warranty Product Repairs to:  
Customer Service Returns  
P.O. Box 280,1025 E. Thompson, Hoopeston, IL 60942-0280  
Questions? Call Customer Service: 1-800-621-5485  
0099000621/0206  
IMPORTANT SAFETY INSTRUCTIONS  
WARNING – RISK OF EXPLOSIVE GASES  
WORKING IN VICINITY OF A LEAD-ACID BATTERY IS DANGEROUS. BAT-  
TERIES GENERATE EXPLOSIVE GASES DURING NORMAL BATTERY  
OPERATION. FOR THIS REASON, IT IS OF UTMOST IMPORTANCE THAT  
EACH TIME BEFORE USING YOUR CHARGER, YOU READ THIS MANUAL  
AND FOLLOW THE INSTRUCTIONS EXACTLY.  
To reduce risk of battery explosion, follow these instructions and those published by  
battery manufacturer and manufacturer of any equipment you intend to use in vicinity of  
battery. Review cautionary markings on these products and on engine.  
SAVE THESE INSTRUCTIONS  
This manual contains important safety and operating instructions for battery charger  
model SC-7500A.  
WARNING: Handling the cord on this  
product or cords associated with ac-  
cessories sold with this product, may  
expose you to lead, a chemical known  
to the State of California to cause  
cancer and birth defects or other  
reproductive harm. Wash hands after  
handling.  
To reduce risk of electrical shock,  
unplug the charger from the outlet  
before attempting any maintenance or  
cleaning.  
• Always charge battery in a well-venti-  
lated area.  
WARNING: Battery chargers get hot  
during operation and must have proper  
ventilation. Air needs to flow around  
entire charger. Do not set charger on  
flammable materials like carpeting,  
upholstery, paper, cardboard, etc.  
Charger may damage leather and melt  
plastic and rubber.  
• Read all instructions and cautions  
printed on the battery charger, battery,  
and vehicle or equipment using bat-  
tery.  
• Use charger only on lead-acid type  
rechargeable batteries, such as those  
used in cars, trucks, tractors, air-  
planes, vans, RVs, trolling motors, etc.  
This charger is not intended to supply  
power to a low voltage electrical  
system other than in a starter-motor  
application.  
HELP US HELP YOU ——  
Remember:  
Place charger as far away from the bat-  
tery being charged as the charger cables  
will permit.  
Never use charger for charging dry  
cell batteries that are commonly used  
with home appliances like radios, ste-  
reos, remote controls, etc. These bat-  
teries may burst and cause personal  
injury.  
Do not expose charger to rain or snow.  
Never charge a frozen battery. If battery  
fluid (electrolyte) becomes frozen, bring  
battery into a warm area to thaw before  
you begin charging.  
Never allow battery acid to drip on char-  
ger when reading specific gravity or filling  
battery.  
• Do not disassemble charger. Take it  
to a qualified service professional if  
service or repair is required. Incorrect  
assembly may result in fire or electri-  
cal shock.  
Never set a battery on top of the charger.  
3
Neverplacechargerdirectlyabovebattery  
being charged. The gases from the battery  
will corrode and damage the charger.  
topreventitfrombeingsteppedon, tripped  
over, or damaged.  
Never pull out the plug by the cord when  
unplugging the charger. Pulling on the  
cord may cause damage to the cord or  
the plug.  
Never touch the battery clamps together  
when the charger is on. You could cause  
a spark.  
Never operate charger if it has received  
a hard blow, been dropped, or otherwise  
damaged.Takeittoaqualifiedprofessional  
for inspection and repair.  
Do not operate the charger if it has a  
damaged power cord or plug. Have the  
cord replaced.  
Besuretopositionthechargerpowercord  
PERSONAL SAFETY PRECAUTIONS  
Wear complete eye and clothing  
protection when working with lead-  
acid batteries.  
Remove all personal metal items  
from your body such as rings, brace-  
lets, necklaces and watches, while  
working with a lead-acid battery. A bat-  
tery can produce a short circuit current  
high enough to weld a ring (or the like)  
to metal, causing a severe burn.  
Make sure that someone is within  
range of your voice to come to your  
aid if needed while you work with or  
are near a lead-acid battery.  
Take care not to drop any metal tool  
or metal object onto the battery. This  
may spark or short circuit the battery  
or another electrical device that may  
cause an explosion.  
Have plenty of fresh water and soap  
nearby for use in case battery acid  
contacts your eyes, skin, or clothing. If  
this happens, wash immediately with  
soap and water. Then get medical at-  
tention.  
Always operate the battery charger in  
an open, well-ventilated area.  
Avoid touching your eyes while  
working with a battery. Acid particles  
(corrosion) may get into your eyes. If  
this occurs, flush eyes immediately  
with running cold water for at least 10  
minutes. Then immediately get medi-  
cal attention.  
Never smoke or allow a spark or flame  
in the vicinity of the battery or engine.  
Batteries generate explosive gases.  
Neutralize any acid spills thoroughly  
with baking soda before attempting to  
clean up.  
4
BEFORE USING YOUR BATTERY CHARGER  
It is important to understand your charger's requirements. This section will tell you about  
your charger's electrical requirements and how to prepare a battery for charging.  
PLUGGING IT IN  
Wrap clamp cables after unplugging the  
power cord from the AC wall outlet and  
store your charger in a dry location.  
Your charger requires a 120V AC 2-prong  
wall outlet receptacle installed according  
to all local codes and ordinances.  
USING AN EXTENSION CORD  
The use of an extension cord is not rec-  
ommended. If you must use an extension  
cord, please make sure that you follow  
these guidelines:  
• Make sure that the pins on charger's  
power cord fit firmly into the extension  
cord, and that the extension cord fits  
firmly into the receptacle.  
• Checkthattheextensioncordisproperly  
wired and in good electrical condition.  
• Make sure that the wire size is large  
enough for its length and for the AC  
ampere rating, as specified in the chart  
below.  
ASSEMBLING YOUR CHARGER  
Included with your battery charger are two  
cord wrap cleats for storage of the clamp  
cables.  
To install, align the two tabs to correspond  
with the two receptacles and push until you  
hear a snap.  
MINIMUM RECOMMENDED EXTENSION CORD  
Length of Cord, in Feet  
AWG* Size of Cord  
25  
18  
50  
16  
100 150  
12 10  
*AWG=American Wire Gauge  
PREPARING YOUR BATTERY TO BE CHARGED  
It is important that you read and follow these guidelines while you are preparing to charge  
the battery.  
• Make sure that you have a 6 or 12 volt  
lead-acid battery. Determine voltage of  
battery by referring to vehicle owner’s  
manual or the battery markings. Charge  
battery initially at charger’s lowest rate.  
Take time to read all of the battery  
manufacturer’s specific precautions,  
such as removing or not removing vent  
caps while charging, and recommended  
rates of charge.  
• Cleanthebatteryterminals.Becarefulto  
keep corrosion from getting in or around  
your eyes or on your hands.  
• Be sure that the area around the bat-  
tery is well ventilated while it is being  
charged. Gas can be forcefully blown  
away by using a piece of cardboard or  
other nonmetallic material as a fan.  
• Wearsafetyglasses.SeeadditionalPer-  
sonal Safety Precautions” on page 4.  
• If it is necessary to remove the battery  
from the vehicle to charge it, always  
remove the grounded terminal from the  
battery first. Turn off all vehicle acces-  
sories to avoid sparks from occurring.  
• If required, for batteries with removable  
ventcaps,adddistilledwatertoeachcell  
until the battery acid reaches the level  
recommendedbythemanufacturer.This  
willhelppurgeexcessivegasesfromthe  
cells.Becarefulnottooverfill.Ifyouhave  
asealedbatterywithnon-removablevent  
caps, no action is necessary.  
NOTE: A marine (boat) battery installed  
in a boat must be removed and charged  
on shore.  
5
OPERATING INSTRUCTIONS  
NOTE: A marine (boat) boat battery must be removed and charged on shore. To charge  
it on board requires equipment specially designed for marine use.  
IMPORTANT: Follow all safety instructions and precautions when charging your battery.  
Wear complete eye protection and clothing protection. Charge your battery in a well-  
ventilated area.  
CHARGING BATTERY IN THE  
VEHICLE:  
part of the chassis or engine block,  
away from the battery (see figure).  
DO NOT connect clamp to negative  
battery post, carburetor, fuel line or  
sheet metal part.  
1. Avoid personal injury by keeping clear  
of fan blades, belts, pulleys and other  
engine parts.  
Connecting to a positive-grounded  
system: Connect the black (NEGA-  
TIVE) output clamp to the NEGATIVE  
post of the battery. Rock and twist  
the clamp back and forth to be sure  
a solid electrical connection is made.  
Then connect the red (POSITIVE)  
output clamp to a heavy, unpainted  
metal part of the chassis or engine  
block, away from the battery. DO NOT  
connect clamp to positive battery  
post, carburetor, fuel line or sheet  
metal part.  
2. Avoid damaging the charger by keep-  
ing the power cord and output cords  
away from the hood, door or moving  
engine parts.  
3. Note the polarity of the battery posts  
by checking the identification marks  
on the battery: POSITIVE (POS, P or  
+) and NEGATIVE (NEG, N or -). The  
positive post is usually larger than the  
negative post.  
4. Identify which battery post is ground-  
ed or connected to the chassis. THIS  
IS NORMALLY THE NEGATIVE  
POST.  
6. Plug power cord into a 120V AC  
2-prong wall outlet. The charger will  
be set to the default state of 12V  
REGULAR battery type, no charge  
rate (tester mode).  
7. Press the appropriate control buttons  
to select the desired charge rate and  
battery type. Within a few seconds,  
the CHARGING (yellow) LED should  
light and the charging process should  
start. If the CHECK (red) LED is on,  
check for correct cable connections.  
8. To disconnect the charger, unplug  
its power cord before attempting to  
disconnect the output clamps. Then,  
standing away from the battery, re-  
move the output clamp from the chas-  
sis or engine block. Finally, remove  
the output clamp from the battery  
post.  
NEGATIVE GROUNDED SYSTEM  
5. Connecting to a negative-grounded  
system: Connect the red (POSITIVE)  
output clamp to the POSITIVE post of  
the battery. Rock and twist the clamp  
back and forth to be sure a solid  
electrical connection is made. Then  
connect the black (NEGATIVE) output  
clamp to a heavy, unpainted metal  
9. Clean and store the charger in a dry  
location.  
6
USING ENGINE START  
CHARGING BATTERY REMOVED  
FROM THE VEHICLE:  
Your battery charger can be used to jump  
start your car if the battery is low. Fol-  
low these instructions on how to use the  
ENGINE START feature.  
POSITIVE  
NEGATIVE  
RY  
GER  
BATTE
IMPORTANT: Follow all safety instructions  
and precautions when charging your bat-  
tery. Wear complete eye protection and  
clothing protection. Charge your battery  
in a well-ventilated area.  
POWER  
CORD  
TO  
GROUNDED  
POWER  
OUTLET  
IMPORTANT: Using the ENGINE START  
feature WITHOUT a battery installed in  
the vehicle could cause damage to the  
vehicle’s electrical system.  
1. Note the polarity of the battery posts by  
checkingtheidentificationmarksonthe  
battery: POSITIVE (POS, P or +) and  
NEGATIVE (NEG, N or -). The positive  
post is usually larger than the negative  
post.  
2. Attach at least a 24-inch-long, 6-gauge  
(AWG), insulated battery cable to  
NEGATIVE (NEG, N or -) battery post.  
Rockandtwisttheclampbackandforth  
to be sure a solid electrical connection  
is made.  
3. Connect the red (POSITIVE) output  
clamp to the POSITIVE battery post.  
Rockandtwisttheclampbackandforth  
to be sure a solid electrical connection  
is made.  
4. Position yourself as far away from the  
battery as possible, and then connect  
the black (NEGATIVE) output clamp to  
the free end of the cable.  
1. Forbatteryconnections,seepage6and  
follow instructions 1 – 6 of CHARGING  
BATTERY IN THE VEHICLE. With the  
chargerpluggedinandconnectedtothe  
battery of the vehicle, set the CHARGE  
RATE to 75A START. Only the 75A  
START, CHARGING, and VOLTAGE  
LEDs should be lit, unless the 6V  
REGULAR battery type has been se-  
lected. In that case, the 6V REGULAR  
LED will also be lit.  
2. Crank the engine for no more than 5  
seconds. If engine does not start, wait  
3 minutes before cranking again.  
3. Aftertheenginestarts,unplugthepower  
cord before disconnecting the output  
clamps from the battery.  
4. Clean and store the charger in a dry  
location.  
5. Plug the power cord into a 120V AC  
2-prongwalloutlet.Thechargerwillbeset  
tothedefaultstateof12VREGULARbat-  
tery type, no charge rate (tester mode).  
6. Press the appropriate control buttons  
to select the desired charge rate and  
battery type. Within a few seconds, the  
CHARGING (yellow) LED should light  
and the charging process should start.  
If the CHECK (red) LED is on, check for  
correct cable connections.  
7. To disconnect the charger, unplug its  
powercordbeforeattemptingtodiscon-  
nectthechargerclamps.Then,standing  
away from the battery, remove the out-  
put clamp from the NEGATIVE battery  
post. Finally, remove the output clamp  
from the POSITIVE battery post.  
8. Clean and store the charger in a dry  
location.  
NOTE:Duringthestartingsequencelisted  
above, the charger is set to one of three  
states.  
1. Wait for cranking - The charger waits  
untiltheengineisactuallybeingcranked  
before delivering 75 amps for engine  
start. The charger delivers charge at a  
rate of up to 12 amps while waiting and  
will reset if the engine is not cranked  
within 5 minutes. (If the charger resets,  
it sets itself for a 2A charge and 12V  
REGULAR battery.) While waiting for  
cranking, the digital display shows  
the battery voltage (it can’t be set to  
percent).  
2. Cranking - When cranking is detected,  
the charger will automatically deliver  
up to its maximum output (at least75A)  
as required by the starting system for  
7
up to 5 seconds or until the engine  
cranking stops. The digital display  
shows a countdown of the remaining  
crank time in seconds. It starts at 5 and  
counts down to 0.  
the cool down period, no current is de-  
livered to the battery. After 3 minutes,  
the 75A START LED will stop blinking  
andwilllightcontinuously,indicatingthat  
anothercrankcyclecanbestarted.The  
digital display will change from display-  
ing the countdown back to displaying  
the battery voltage. The CHARGING  
LED will then be lit.  
3. Cool Down - After cranking, the char-  
ger enters a mandatory 3-minute (180  
second) cool down state. During this  
period, no settings can be changed.  
The buttons are ignored. The digital  
display indicates the remaining cool  
down time in seconds. It starts at 180  
and counts down to 0. The 75A START  
LED blinks once every second. During  
ENGINE STARTING NOTES:  
• If the battery is disconnected during  
the cool down period, the charger will  
reset.  
USING YOUR BATTERY CHARGER  
OVERVIEW  
a normal charge. If the charger detects a  
sulfated battery, the charger will switch to  
a special mode of operation designed for  
such batteries. Activation of the special  
desulfation mode is indicated by blinking  
the CHARGING LED. If successful, nor-  
mal charging will resume after the battery  
is desulfated. The CHARGING LED will  
then stop blinking and light continuously.  
Desulfation could take up to 10 hours. If  
desulfation fails, charging will be aborted  
and the CHECK (red) LED will blink.  
Using this battery charger is very simple.  
First, connect the battery and AC power  
following the precautions listed under  
“OPERATING INSTRUCTIONS”. Then  
select the appropriate BATTERY TYPE  
and CHARGE RATE for your battery. The  
charger will then do everything automati-  
cally. This section explains a few details.  
CHARGING: If the charger does not  
detect a properly connected battery, the  
CHECK (red) LED will light continuously  
until such a battery is detected. Charging  
will not begin while the CHECK LED is on.  
When charging begins, the CHARGING  
LED will be lit.  
COMPLETION OF CHARGING:  
Charge completion is indicated by  
the CHARGED (green) LED; when  
lit, the charger has stopped charging  
and switched to the Maintain Mode of  
operation.  
AUTOMATIC SHUT OFF: When the 2A,  
12A   30A charge rate is selected, the  
charger is set to perform an automatic  
charge. When an automatic charge is  
performed, the charger stops charging au-  
tomatically after the battery is charged.  
MAINTAIN MODE: When the CHARGED  
(green) LED is lit, the charger has started  
Maintain Mode. This mode of operation is  
also known as Float-Mode Monitoring. In  
this mode, the charger keeps the battery  
fully charged by delivering a small amount  
of current, when necessary. The voltage  
is maintained at a level determined by the  
BATTERY TYPE selected.  
ABORTED CHARGE: If charging can’t  
be completed normally, charging will be  
aborted. When charging is aborted, the  
charger’s output is shut off and the red  
CHECK LED and digital display blink on  
and off (at opposite times). In that state, the  
charger ignores all buttons. To reset from  
after an aborted charge, either disconnect  
the battery or unplug the charger.  
GENERAL CHARGING NOTES:  
The charger is designed to control its  
cooling fan for efficient operation. Con-  
sequently, it is normal for the fan to start  
and stop when maintaining a fully charged  
battery. The fan does not run in Tester  
Mode.  
DESULFATION MODE: If a battery is  
left discharged for an extended period,  
it could become sulfated and not accept  
8
If the charge mode is changed after charg-  
ing has started (by pressing the CHARGE  
RATE or BATTERY TYPE button), the  
charging process will be restarted.  
The voltage displayed during charging is  
the charging voltage and usually will be  
higher than the battery’s resting voltage.  
CHARGER CONTROLS  
DISPLAY MODE SWITCH  
With the exception of AGM and gel cell  
batteries, all other battery types may or  
may not have vent caps. Vent caps are  
located on top of the battery and provide a  
meanstoadddistilledwaterwhenneeded.  
Batteriesshouldbemarkedwiththeirtype.  
If charging a battery that is not marked,  
check the manual of the item that uses  
the battery. If the battery type is unknown,  
use the REGULAR setting. Make sure the  
batterycomplieswiththesafetyinstructions  
on page 3.  
Use this switch button to set the function of  
the digital display to one of the following.  
BATTERY %: The digital display shows  
an estimate of the percent of charge of  
the battery connected to the charger  
battery clamps.  
VOLTAGE:Thedigitaldisplayshowsthe  
voltage at the charger battery clamps in  
DC volts.  
• ALTERNATOR %: The digital display  
shows an estimated percentage of the  
output of the vehicle charging system  
connectedtothechargerbatteryclamps  
as compared to a properly functioning  
system.  
CHARGE RATE SWITCH  
Use this switch button to set the maximum  
charge rate to one of the following.  
• 2ASLOWCHARGERATE:Intendedfor  
charging small batteries such as those  
commonlyusedingardentractors,snow  
mobiles and motorcycles. The 2A rate  
is not intended to be used as a trickle  
charger for larger batteries.  
12A FAST   30A RAPID CHARGE  
RATE: Use for charging automotive bat-  
teries, marine batteries, and deep cycle  
batteries. Not intended for industrial  
applications.  
BATTERY TYPE SWITCH  
Use this switch button to set the type of  
battery to be charged to one of the fol-  
lowing.  
12V REGULAR: This is the type of  
battery usually used in cars, trucks,  
and motorcycles. These batteries have  
vent caps and are often marked “low  
maintenance” or “maintenance-free”.  
12V DEEP CYCLE: Deep cycle batter-  
ies are usually marked as “deep cycle”  
or “marine”. Deep cycle batteries are  
usually larger than the other types.  
12V AGM/GEL: AGM and gel cell bat-  
teries have sealed cases without vent  
caps. Such batteries are often smaller  
than the other types.  
75ASTART:Provides75ampsforcrank-  
ing an engine with a weak or run down  
battery. Always use in combination with  
a battery.  
NOTE: To turn OFF the charger, unplug  
from the power cord from the wall outlet.  
6V REGULAR: This is the type of bat-  
tery usually used in antique and some  
specializedvehicles.The6VREGULAR  
batterytypeisnotselectableforbatteries  
greater than 8.5V DC.  
9
CONTROL PANEL GUIDE  
10  
USING THE BUILT-IN BATTERY TESTER  
OVERVIEW  
powered up, the battery will remain a  
tester (not a charger) indefinitely, unless  
a charge rate is selected.  
This battery charger has a built-in battery  
tester that displays either an accurate  
battery voltage or an estimate of the  
battery’s relative charge based on the  
battery voltage and the Battery Council  
International scale.  
TESTING AFTER CHARGING  
After the battery has been changed from  
tester to charger (by selecting a charge  
rate), it remains a charger. To change  
the battery back to a tester, press the  
CHARGE RATE switch until all charge  
rate LEDs are off.  
TESTING SEQUENCE  
There are four basic steps required to  
use the SC-7500A as a battery tester.  
1. Connect the charger battery clamps to  
the battery. Be sure to follow all of the  
precautions listed under “OPERATING  
INSTRUCTIONS”.  
TESTER STATUS LEDs  
When the SC-7500A is operating as  
a battery tester, the status LEDs light  
under the following conditions:  
2. Connectthechargerpowercordtoa120V  
AC 2-prong wall outlet.Again, be sure to  
follow all of the precautions listed under  
“OPERATING INSTRUCTIONS”.  
3. If necessary, press the BATTERY  
TYPE button until the correct type is  
indicated.  
4. Read the voltage on the digital display  
or press the display mode button to set  
the tester to BATTERY % and read the  
battery percent.  
• The CHARGED (green) LED will light if  
a charged battery is tested.  
• The CHARGING (yellow) LED does not  
light in the battery test mode.  
• The CHECK (red) LED lights unless a  
properly connected battery is detected.  
• When the tester display mode is set to  
VOLTAGE,theCHARGEDandCHARG-  
ING LEDs won't light.  
INITIAL PERCENT CALCULATION  
When a battery % is calculated for the  
first time after connecting a battery, the  
digital display will show three dashes  
(“---”) for a period as long as several  
seconds while the tester analyzes the  
battery.  
TESTER AND CHARGER  
When first turned on, the SC-7500A oper-  
ates only as a tester, not as a charger. To  
continue to use it as only a tester, avoid  
pressing the CHARGE RATE switch but-  
ton. Selecting a charge rate activates the  
battery charger and deactivates the tester.  
Pressing the CHARGE RATE button when  
the 75A Start LED is lit (except during the  
180 second cool down) will shut off the  
charger and activate the tester.  
NOTES FOR TESTING BATTERY %  
A recently charged battery could have a  
temporarily high voltage due to what is  
known as “surface charge”. The voltage  
of such a battery will gradually drop during  
the period immediately after the charging  
system is disengaged. Consequently, the  
tester could display inconsistent values  
for such a battery. For a more accurate  
reading, the surface charge should be  
removed by temporarily creating a load on  
the battery, such as by turning on lights or  
other accessories.  
POWER-UP IDLE TIME LIMIT  
If no switch button is pressed within ten  
minutes after the battery is first powered  
up, the charger will automatically switch  
from tester to charger, if a battery is  
connected. In that case, the battery will  
be set for the 2A charge rate and 12V  
REGULAR battery type.  
The battery % ranges from 0 to 100.  
TESTER WITHOUT TIME LIMIT  
The battery tester is only designed to test  
batteries. Testing a device with a rapidly  
changing voltage could yield unexpected  
or inaccurate results.  
If either the DISPLAY MODE or BAT-  
TERY TYPE button is pressed within  
the first ten minutes after the battery is  
11  
USING THE BUILT-IN ALTERNATOR TESTER  
This battery charger has a built-in alter-  
TESTER STATUS LEDs  
nator tester that displays either an accu-  
rate alternator voltage or an estimate of  
the alternator’s relative output compared  
to normal alternators. The Alternator %  
values displayed should be taken as  
general reference, not precise diagnosis.  
The alternator tester functions the same  
as the battery tester (see previous sec-  
tion of this manual for details) with a few  
differences.  
When the SC-7500A is operating as an  
alternator tester, the status LEDs light  
under the following conditions.  
• The CHARGED (green) LED will light  
if the output of the charging system is  
at the normally desired level.  
• The CHARGING (yellow) LED does  
not light in the alternator test mode.  
• The CHECK (red) LED lights if the  
VOLTAGE is much higher or lower  
than normally desired.  
TESTING SEQUENCE  
There are three basic steps required to use  
the SC-7500A as an alternator tester.  
• When the tester display mode is set  
to VOLTAGE, the CHARGED and  
CHARGING LEDs won't light (it could  
be testing a battery or an alternator).  
1. Connect the charger battery clamps to  
the battery or charging system. Be sure  
to follow all of the precautions listed  
under “OPERATING INSTRUCTIONS”.  
2. Connect the charger power cord to a  
120VAC 2-prong wall outlet. Again, be  
sure to follow all of the precautions listed  
under “OPERATING INSTRUCTIONS”.  
3. Start the vehicle and turn on the  
vehicle’s headlights. Read the voltage  
on the digital display or press the  
DISPLAY MODE button to set the  
tester to ALTERNATOR % and read  
the alternator percent.  
ALTERNATOR TESTING NOTES  
• The alternator percent display can  
range from 0 to 199.  
• The DISPLAY MODE cannot be set to  
ALTERNATOR % during charging.  
12  
BATTERY PERCENT AND CHARGE TIME  
This charger adjusts the charging time in  
There are some important facts to keep in  
mind when charging a battery.  
order to charge the battery completely,  
efficiently and safely. The microproces-  
sor automatically makes the necessary  
decisions. However, this section includes  
guidelines that can be used to estimate  
charging times.  
• When the display indicates 77%  
charged, the battery has been charged  
enough to start most vehicles and has  
already been charged as much as by  
many other battery chargers.  
The duration of the charging process de-  
pends on three factors:  
• When the display indicates 85%  
charged, the battery has already been  
charged at least as much as by most  
other battery chargers.  
1. Battery State – If a battery has only  
been slightly discharged, it can be  
charged in less than a few hours.  
The same battery could take up to 10  
hours if very weak. The battery state  
can be estimated by using the built-in  
tester (see page 11). The lower the  
reading the longer charging will take.  
• The battery % shown in tester mode  
is an estimate based on the bat-  
tery voltage and the Battery Council  
International scale. The battery %  
shown in charger mode is an estimate  
of the relative charge in the battery  
compared to the charge it should have  
if the charging process is allowed to  
complete.  
2. Battery rating – A higher rated  
battery will take longer to charge  
than a lower rated battery under the  
same conditions. A battery is rated in  
ampere-hours (AH), reserve capacity  
(RC) and cold cranking amps (CCA).  
The lower the rating the quicker the  
battery will be charged.  
• The battery % shown in tester mode  
can be used to estimate the relative  
charge time. The lower the % shown,  
the longer the charge time for a given  
battery.  
3. Charge rate – The charge rate is  
measured in amps. This charger  
provides charge rates of 2A, 12A  
and 30A. The 75A rate is for engine  
start only. The 2A rate is for charg-  
ing smaller batteries such as those  
used for motorcycles and garden  
tractors. Such batteries should not be  
charged using the 12A or 30A rate.  
The 12A and 30A rates are for charg-  
ing larger batteries. In the 30A mode,  
the charger begins at a low charge  
rate and increases the charge rate if  
it is determined that the battery can  
accept the higher rate. All charging  
modes will decrease the charge rate  
as the battery approaches maximum  
charge. After the charging process  
has started, the digital display can be  
used to determine charging progress  
by selecting the BATTERY % mode.  
• The battery % shown in charger mode  
is an indication of the relative progress  
of the charging process. The higher  
the battery % displayed, the less  
charge time remains.  
• The more a battery is discharged,  
the faster it absorbs charge from a  
charger. That means that the battery  
% increases faster at the beginning  
of the charging process than at the  
end. In other words, it takes longer  
for the battery to absorb the last few  
percent of charge than the first several  
percent.  
13  
CHARGING TIPS  
Read this entire manual before using your charger. The tips below serve only as a guide  
for specific situations.  
If your vehicle won’t start:You don’t need  
to fully charge a battery to start your ve-  
hicle. If the charger won’t start your vehicle  
using the 75ASTART rate, try charging the  
battery using the 12A   30A rate for 10  
or 15 minutes. That should charge the bat-  
tery enough to allow the 75A START rate  
to start the vehicle. If the vehicle will then  
be operated continuously for an extended  
period (such as a long drive), the vehicle  
could charge the battery back to normal  
during that period. If the vehicle will only  
be operated for a short period (short drive),  
the battery might need to be charged again  
before it could start the vehicle again.  
Reviving your battery: If you only wish  
to charge your battery enough to operate  
your vehicle, you don’t need to wait for the  
entire charging process to be completed.  
When the charger displays a battery %  
of 77 or more (see page 13), the battery  
has usually been charged enough for the  
vehicle to start and operate normally.  
Completing an interrupted charge: If  
the charging process has been interrupted  
and restarted after the charger displays a  
battery % of 85 or more, the charger could  
go straight to Maintain Mode (see page 8).  
However, if the original charge was started  
using 12A   30A, the charge can often  
be completed using the 2A rate.  
MAINTENANCE AND CARE  
A minimal amount of care can keep your battery charger working properly for years.  
1. Clean the clamps each time you are finished charging. Wipe off any battery fluid  
that may have come in contact with the clamps to prevent corrosion.  
2. Coil the input and output cords neatly when storing the charger. This will help pre-  
vent accidental damage to the cords and charger.  
3. Occasional cleaning of the case of the charger with a soft cloth will keep the finish  
shiny.  
14  
TROUBLESHOOTING  
Performance problems often can be corrected by the user. Please read through this chart  
for a possible solution to common problems.  
PROBLEM  
POSSIBLE CAUSE  
SOLUTION  
The battery is connected  
and the charger is on,  
but isn't charging.  
The charger is in tester  
mode, not charger mode.  
Press the CHARGE  
RATE button to activate  
charging and select a  
charge rate.  
Indicator lights are lit in  
an erratic manner not  
explained in the “Using  
Your Battery Charger”  
section.  
You might have acciden-  
tally activated a special  
diagnostic mode.  
Make sure nothing is  
touching the control  
panel, then unplug the  
charger and plug it in  
again.  
The charger may be  
defective.  
Return to place of pur-  
chase for replacement.  
The CHECK (red) LED  
always flashes before  
the battery is completely  
charged.  
The incorrect BATTERY  
TYPE may have been  
selected.  
Reset the charger by  
unplugging it or briefly  
disconnecting it or briefly  
disconnecting the nega-  
tive battery clip. Select  
the desired CHARGE  
RATE and BATTERY  
TYPE again, if neces-  
sary.  
This will happen if the  
battery did not reach full  
charge within 24 hours.  
May be due to a very  
large battery or a bank  
of batteries requiring  
more power than a 30/12  
Amp charger can deliver  
within 24 hours. The bat-  
tery may also be faulty.  
Engine crank time is less  
than specified.  
Starter motor may be  
drawing more than 80  
Amps.  
Charge the battery at the  
12A   30A rate for 10  
to 15 minutes then crank  
the engine.  
The green CHARGED  
LED lights a few minutes  
after connecting to the  
battery.  
The battery may be  
fully charged or recently  
charged, leaving the bat-  
tery voltage high enough  
to appear to be fully  
charged.  
If the battery is in a ve-  
hicle, turn the headlights  
on for a few minutes  
to reduce the battery  
voltage and try charging  
again.  
The incorrect BATTERY  
TYPE may have been  
selected.  
Reset the charger by un-  
plugging it or briefly dis-  
connecting the negative  
battery clip. Select the  
desired CHARGE RATE  
and BATTERY TYPE  
again, if necessary.  
15  
WARRANTY  
SCHUMACHER ELECTRIC CORPORATION,  
801 BUSINESS CENTER DRIVE,  
MOUNT PROSPECT, ILLINOIS 60056-2179  
MAKES THIS LIMITED WARRANTY TO THE ORIGINAL PURCHASER AT RETAIL OF  
THIS PRODUCT. THIS LIMITED WARRANTY IS NOT TRANSFERABLE.  
Schumacher Electric Corporation warrants this battery charger for one year from date of  
purchase at retail against defective material or workmanship. If such should occur, the  
unit will be repaired or replaced at the option of the manufacturer. It is the obligation of  
the purchaser to forward the unit together with proof of purchase, transportation and/or  
mailing charges prepaid to the manufacturer or its authorized representative.  
This limited warranty is void if the product is misused, subjected to careless handling, or  
repaired by anyone other than the manufacturer or its authorized representative.  
The manufacturer makes no warranty other than this limited warranty and expressly  
excludes any implied warranty including any warranty for consequential damages.  
THIS IS THE ONLY EXPRESS LIMITED WARRANTYAND THE MANUFACTURER NEI-  
THER ASSUMES NOR AUTHORIZES ANYONE TO ASSUME OR MAKE ANY OTHER  
OBLIGATION TOWARDS THE PRODUCT OTHER THAN THIS EXPRESS LIMITED  
WARRANTY. THE MANUFACTURER MAKES NO WARRANTY OF MERCHANTABIL-  
ITY OR FITNESS FOR PURPOSE OF THIS PRODUCTAND EXPRESSLY EXCLUDES  
SUCH FROM THIS LIMITED WARRANTY.  
SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL  
OR CONSEQUENTIAL DAMAGES OR LENGTH OF IMPLIED WARRANTY SO THE  
ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU.  
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTSAND YOU MAYALSO HAVE  
OTHER RIGHTS THAT VARY FROM STATE TO STATE.  
WARRANTY VALIDATION: The enclosed “Warranty Validation Card” must be completed  
and mailed within 10 days of product purchase to activate this limited warranty.  
16  

Subaru Robin Power Products Ex40 User Manual
Stinger Sr80 User Manual
Sanyo N 1250scrl User Manual
Sanyo 26tw72r User Manual
JET HP 35A User Manual
HITACHI 50PD9800TA User Manual
Gbt 500a Battery Tester User Manual
BROTHER HL L2310D User Manual
ASUS X751L User Manual
ASUS VC239N User Manual