MARINE CORPS TM 6115-12/7
4-10. GENERAL. (cont)
Organizational Troubleshooting - Continued
TEST OR INSPECTION
If VOLTAGE meter incorrect, go to Malfunction 21.
Verify that voltage is present and power is available for load.
If power available, ensure connections C and D on current
shunt (R2) are secure.
Check continuity of following wires.
U110A18 (R2-C to TB3-13)
U109A18 (R2-D to TB3-14)
U110B18 (TB3-13 to M2(+)) U109B18 (TB3-14 to M2(-))
Repair or replace wires as necessary. If wires check good,
replace OUTPUT CURRENT meter (paragraph 4-76).
If no power is available, check continuity of wires V101B00
(S4-A2 to bulkhead connector) and V102B00N (S4-B2 to
If wires check good, replace contactor (paragraph 4-83c).
VOLTAGE METER INDICATES VOLTAGE BUT UNABLE TO ADJUST WITH VOLTAGE ADJUST KNOB.
To prevent injury, ensure that
Disconnect connector P2 from GECM.
Check continuity on wires
U114C18 (M1(-) to P2-E) and U113C18 (M1(+) to P2-F).
If continuity good, go to Step 2.
If no continuity, repair or replace wires,
With connector P2 disconnected from GECM, measure resistance
between P2-P and P2-N while rotating VOLTAGE ADJUST knob.
If resistance measures between O and 10k ohms and is
adjustable with VOLTAGE ADJUST knob, go to Step 3.
If resistance is not adjustable or is above 10k ohms,
replace VOLTAGE ADJUST knob (paragraph (4-77b).
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