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ELECTRICAL TROUBLESHOOTING - HORN INOPERATIVE
ELECTRICAL TROUBLESHOOTING - BACKUP ALARM INOPERATIVE

Field Maintenance Manual For M400T And M400W
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TM 5-3805-292-23
0006
ELECTRICAL TROUBLESHOOTING - DOME LIGHT/POWER OUTLET INOPERATIVE
0006
Dome light
and outlet
Determine Condition.
inoperative?
NO
Dome light
ONLY
Determine Condition.
inoperative?
YES
YES
Check 15A dome/power outlet
Replace fuse
Fuse okay?
NO
fuse (TM 5-3805-292-10).
(TM 5-3805-292-10).
YES
NO
Check dome bulb (WP 0133).
Bulb okay?
Replace bulb (WP 0133).
NO
YES
Disconnect dome light (WP 0133)
or power outlet (WP 0158).
Press power button to turn power
on to machine (TM 5-3805-292-
10).
Measure voltage between dome
Perform Open Harness Test for circuit
light connector 69-A, circuit 817E
12V present?
NO
817 (WP 0173).
(R), harness side or power outlet
connector 72, circuit 817C (R),
harness side and ground
(WP 0175, Frame 12. RH
Console and Frame 19.
Miscellaneous Circuits).
YES
Check continuity between dome
light connector 69-C, circuit 178D
(B), harness side or power outlet
connector 71, circuit 178M (B),
Repair circuit 178D or 178M (WP 0173) or
Continuity
NO
harness side and ground
present?
replace chassis wiring harness (WP 0146).
(WP 0175, Frame 12. RH
Console and Frame 19.
Miscellaneous Circuits)
YES
Replace dome light (WP 0133)
or power outlet (WP 0158).
0006-47


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