Schumacher SC1308 User Manual Download Page 7

battery connections. When the Engine 

Start output is enabled the display will  

show “

rdy

”. 

4.

Crank the engine until it starts or 5

seconds pass. If the engine does not

start, wait a few minutes before cranking 

again. This allows the charger and

battery to cool down.

NOTE:

 After 3 minutes in Engine Start 

mode, the charger will enter into a cool-

down period of 180 seconds, to allow the 

charger and the battery to cool down.  

The digital display indicates the remaining 

cool down time in seconds. It starts at 180 

and counts down to 0. After 3 minutes, the 

digital display will change from displaying 

the countdown to displaying “

rdy

”.

5.

If the engine fails to start, use the 

30A Boost rate for 5 more minutes 

before attempting to crank the engine

again.

6.

After the engine starts, unplug the AC

power cord before disconnecting the

battery clamps from the vehicle.

7.

Clean and store the charger in a dry

location.

NOTE:

 If the engine does turn over but 

never starts, there is not a problem with 

the starting system; there is a problem 

somewhere else with the vehicle. STOP 

cranking the engine until the other problem 

has been diagnosed and corrected.

USING THE BATTERY VOLTAGE TESTER 

1.

With the charger unplugged from the

AC outlet, connect the charger to the

battery, following the instructions given

in previous sections.

2.

Plug the charger AC power cord into

the AC outlet.

3.

Press the 

 

Battery Type button until 

the correct type is indicated.

4.

Read the voltage on the digital display.

Keep in mind that this reading is only a

battery voltage reading; a false surface

charge may mislead you. Compare the

reading to the following chart.

6V Battery 

Voltage Reading

12V Battery 

Voltage Reading

Battery 

Condition

6.4 or more

12.8 or more

Charged

6.1 to 6.3

12.2 to 12.7

Needs charging

Less than 6.1

Less than 12.2

Discharged

TESTER AND CHARGER 

When first turned on, the unit operates 

only as a tester, not as a charger. 

Selecting a charge rate activates the 

battery charger and deactivates the 

tester. Pressing the 

 

Rate Selection 

button when the 

 

Engine Start LED 

is lit (except during the 180 second 

cool down) will shut off the charger and 

activate the tester.

POWER-UP IDLE TIME LIMIT

If no button is pressed within 10 minutes 

after the battery charger is first powered up, 

the charger will automatically switch from 

tester to charger if a battery is connected. 

In that case, the charger will be set to the 

Boost rate and AGM battery type.

TESTING AFTER CHARGING

After the unit has been changed from 

tester to charger (by selecting a desired 

rate), it remains a charger. To change the 

battery charger back to a tester, press the 

 

Rate Selection button until all rate 

LEDs are off.

NOTE:

 The battery tester is only designed 

to test batteries. Testing a device with 

a rapidly changing voltage could yield 

unexpected or inaccurate results.

USING THE ALTERNATOR 

PERFORMANCE TESTER

1.

With the charger unplugged from the

AC outlet, connect the charger to the

battery, following the instructions given

in previous sections.

2.

Plug the charger AC power cord into

the AC outlet.

3.

Start the vehicle, rev the engine at

2000 rpm for 30 seconds and turn

on the vehicle’s headlights or other

accessories.

4.

Read the voltage on the digital display.

If you get a reading between 13.4 volts

and 14.6 volts, the alternator is working 

properly. If the reading is less than

13.4 volts or more than 14.6 volts, refer 

to your vehicle’s manual or have the

charging system checked by a qualified 

technician.

Summary of Contents for SC1308

Page 1: ...AL AND READ BEFORE EACH USE This manual will explain how to use the battery charger safely and effectively Please read and follow these instructions and precautions carefully MODEL SC1308 Automatic Ba...

Page 2: ...THE INSTRUCTIONS EACH TIME YOU USE THE CHARGER b To reduce risk of battery explosion follow these instructions and those published by battery manufacturer and manufacturer of any equipment you intend...

Page 3: ...sition and removing AC cord from electric outlet Never allow clips to touch each other 5 2 Attach clips to battery and chassis as indicated in sections 6 and 7 6 FOLLOW THESE STEPS WHEN BATTERY IS INS...

Page 4: ...tates is not recommended and should not be used 8 3 USING AN EXTENSION CORD The use of an extension cord is not recommended If you must use an extension cord follow these guidelines Pins on plug of ex...

Page 5: ...ed VRLA valve regulated lead acid batteries Popular uses include high performance engine starting power sports deep cycle solar and storage batteries 11 OPERATING INSTRUCTIONS WARNING A spark near the...

Page 6: ...uous 12 hour period it will go into abort mode see Aborted Charge section This is usually caused by a drain on the battery or the battery could be bad MAINTAINING A BATTERY The SC1308 charges and main...

Page 7: ...ery Voltage Reading 12V Battery Voltage Reading Battery Condition 6 4 or more 12 8 or more Charged 6 1 to 6 3 12 2 to 12 7 Needs charging Less than 6 1 Less than 12 2 Discharged TESTER AND CHARGER Whe...

Page 8: ...arge voltage May be caused by trying to charge a large battery or bank of batteries on too low of a current setting Try again with a higher current setting or have the battery checked or replaced F04...

Page 9: ...and charges the battery No problem this is normal I press the display button but do not see the percentage of charge When first connected to a battery the display shows voltage only This is normal Th...

Page 10: ...0 sec max on 120 sec min off 100A int 5 sec max on 180 sec min off cUL Input 120V AC 60Hz 4A continuous 19A intermittent Output 6V 12V DC 2 6A int 25A int 60 sec max on 120 sec min off 90A int 5 sec m...

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