Exterior Lights System Check

Exterior Lights System Check

1. Inspect the MKR LP, PARK LP, DOME/PANEL, STOP TRANS/TRLR, and TRN/HAZ circuit breakers to determine if any are open. If a circuit breaker is open, locate and repair the cause of the overload then replace the circuit breaker.
2. Inspect the ground G101 (Diesel), G111 (Gas), G210, and G405 to assure that they are clean and tight.
3. If the stoplamps and hazard flashers do not operate, inspect for a short to ground or an open circuit in the wiring between the IP Fuse Block and the Turn/Hazard Flasher.
4. If a single lamp does not light, inspect the bulb for an open or short in the lamp filament.
5. Inspect the wiring for broken or partially broken conductors inside the insulation which could cause system malfunction but prove to be GOOD in a continuity or voltage test with the system disconnected. These circuits may be intermittent or resistive when in use. The circuit should be monitored for a voltage drop during operation.
6. Inspect for proper installation of aftermarket electronic equipment which may affect the integrity of other systems. Refer to General Electrical Diagnosis General Electrical Diagnosis.