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TM 5-4210-233-14&P-1
Table 4-2.
Unit Troubleshooting-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM-CAB CONTROLS AND INDICATORS
1
HEADLIGHTS (HIGH OR LOW BEAM) DO NOT ILLUMINATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check bulb.
Replace bulb (see para 4-81).
Step 2.
Check dimmer switch on cab floor.
Replace switch (see para 4-9.4).
Step 3.
Check headlight relay for proper operation.
Replace relay (see para 4-9.4).
Step 4.
Check light switch for proper operation.
Replace switch (see para 4-9.4).
Step 5.
Check for +12V at circuit breaker #16 on battery buss.
Replace circuit breaker (see para 4-99).
Step 6.
Check wiring for continuity.
Replace wire (see para 4-9.4).
2
FRONT ID LIGHTS, ID BULLETS (FRONT AND REAR), TAIL LIGHTS,
SIDE ID LAMPS DO NOT ILLUMINATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check bulb.
Replace bulb.
Step 2.
Check for +12V at circuit breaker #7 on headlight buss.
Replace breaker (see para 4-9.4).
Step 3.
Check headlight switch for proper operation.
Replace switch (see para 4-9.4).
4-77
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