MARINE CORPS TM 6115-12/7
4-10. GENERAL. (cont)
Organizational Troubleshooting - Continued
TEST OR INSPECTION
Shut down generator set.
Disconnect connector P3 from GECM and
connector P20 from battery.
Connect ohmmeter between TB3-17
Tap on resistor R3 and check resistance.
should be constant and between 90 and 110 ohms.
If R3 reads open or out of tolerance, replace R3.
If R3 is good,
disconnect battery cable plug connector.
Visually inspect and check continuity of following wires.
P103D14 (P3-A to TB3-4) P103C00 (TB1-4 to bulkhead
P103E14 (TB3-4 to R1-A) P103A00 (bulkhead connector to
P103B14 (R1-B to TB1-3)
Repair or replace wires as necessary. If checks good, visually
Inspect and check continuity of following wires.
V102M14 (P3-C to TB3-1)
V102H00 (TB1-2 to bulkhead
V102J18 (TB3-2 to TB1-2) V102AJ00 bulkhead connector
Repair or replace wires as necessary. If checks good, replace
GECM (paragraph 4-30).
19. PLACING CONTACTOR SWITCH IN CLOSED POSITION DOES NOT CAUSE CLOSED INDICATOR
LIGHT TO COME ON.
To prevent injury, ensure that
Check press-to-test feature of CLOSED indicator light.
If light does not come on, replace lamp (paragraph 4-74).
If light still does not come on, test/replace indicator
light socket (paragraph 4-73).