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TM 9-2320-364-20-2
2-1228
10. HEADLIGHT(S) DO NOT OPERATE (LOW BEAM).
INITIAL SETUP
1.
Go to Step 4 of this
Fault.
START
YES
NO
Circuit breakers CB1 and CB4
not tripped.
Work lights operate indicating
10 to 14 vdc to circuit breaker
CB1.
Headlight lamp faulty.
Headlight wire 1006 faulty.
Headlight wire 1435 faulty.
Circuit breaker CB1 faulty.
Wire 1927 faulty.
Wire 1049 faulty.
Headlights relay R1 wire 1435
faulty.
Headlights relay R1 faulty.
Wire 1017 faulty.
Dimmer relay R5 faulty.
Wire 1006 faulty.
Wire 1292 faulty.
Headlight switch faulty.
Wire 1049 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Visual inspection.
To determine if fault is common
to both headlights.
2-20. ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (Item 44, Appendix G)
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
Does at least one headlight
operate?
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