Napa 85-8100 Instruction Manual page 16

14.2 STARTER SYSTEM TEST PROCEDURE
a. WIth charger UNPLUGGED, connect the tester clamps to the battery as it is
situated in the vehicle: red to the positive(+) terminal, black to the negative (–)
terminal. Rock each clamp back and forth to make a good connection.
NOTE: The battery must be good and fully charged for this test.
b. Only the live voltage will appear on the LED, unless the charger is plugged in, in which
case the charge current is displayed and the FAIL LED is lit. The Starter test will be
bypassed if attempting to select it, until current is removed. UNPLUG the charger. The
PASS/FAIL LEDs will alternate blinking until a crank event is detected.
c. Start the vehicle.
d. Observe the final cranking voltage that appears on the LED:
If the Volts reading is greater than 9.6 volts, the Starting System is OK. The PASS
LED will light.
If the Volts reading is less than 9.6 volts, there is a Starting System problem. The
FAIL LED will light. Check connections, wiring, and starter.
NOTE: If charge voltage exceeds 19.9v, the FAIL LED lights to highlight a potentially
dangerous situation.
14.3 CHARGING SYSTEM (ALTERNATOR) TEST PROCEDURE
The Alternator test is normally selected AFTER the crank (Starter) test. If continuing
from a Starter test, with the vehicle still running, press the Function button to move
from Starter to Alternator test.
a. Connect the tester clamps to the battery: red to positive (+) terminal, black to negative
(–) terminal, if they are not already connected. Rock each clamp back and forth to make
a good connection. NOTE: The battery must be good and fully charged for this test.
b. Only voltage will appear on the LED, unless the charger is plugged in, in which case the
charge current is displayed and the FAIL LED is lit. The Alternator test will be invalidated
until current is removed. UNPLUG the charger.
c. Rev the engine at 2000 rpm for 15 seconds. The PASS/FAIL LEDs will indicate the
result immediately. But as this is a semi-live result that will retain the highest measured
value, it is recommended to wait until this peak voltage stabilizes. If the value drifts into
the pass region, the PASS LED will light. If the value further drifts up and out of the pass
region, then the FAIL LED will stay lit.
d. Observe the volts reading that appears on the LED:
If the Volts reading is between 13.3 and 15.5 volts, the Charging System is OK.
The PASS LED will light.
If the Volts reading is greater than 15.5 volts, there is a Charging System Problem.
The FAIL LED will light. Check regulator.
If the Volts reading is less than 13.3 volts there is a Charging System Problem.
The FAIL LED will light. Check connections, wiring, and starter.
NOTE: If charge voltage exceeds 19.9v, the FAIL LED lights to highlight a potentially
dangerous situation.
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