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This battery charger has a built-in alterna-
tor tester that displays either an accurate
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.
TESTING SEQUENCE
There are three basic steps required to
use the PSC-12500A as an alternator
tester.
1. Connect the charger battery clamps to
the battery or charging system. Be sure
to follow all of the precautions listed un-
der “OPERATING INSTRUCTIONS”.
2. Connect the charger power cord to a
120V AC 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 DIGITAL
DISPLAY button to set the tester to AL-
TERNATOR % and read the alternator
percent.
USING THE BUILT-IN ALTERNATOR TESTER
TESTER STATUS LEDs
When the PSC-12500A 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 CONNECTED LED lights if a VOLT-
AGE is detected.
• When the tester display mode is set to
VOLTAGE, the CHARGED and CHARG-
ING LEDs won't light (it could be testing
a battery or an alternator).
ALTERNATOR TESTING NOTES
• The alternator percent display can range
from 0 to 199.
• The DIGITAL DISPLAY cannot be set
to ALTERNATOR % during charging.
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.
The battery % ranges from 0 to 100.
The battery tester is only designed to test
batteries. Testing a device with a rapidly
changing voltage could yield unexpected
or inaccurate results.