mercury Workshop Repair Guides

Mercury Workshop Service and Repair Manuals

Trailer Lamps|Flow of Diagnosis|Page 8525 > < Trailer Tow Package Wiring|Page 8522
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Trailer Lamps: Flow of Diagnosis

1. Verify the customer concern by operating the trailer illumination.
2. Verify the operation of vehicle exterior lighting. If the vehicle exterior lighting is not operating properly, refer to diagnostics.  See: Symptom

Related Diagnostic Procedures

3. Visually inspect the components of the trailer lamp harness.

VISUAL INSPECTION CHART 

Mechanical 
-

None 

Electrical 
-

Blown fuse:
-

15 A STOP LAMP

-

10 A TAIL LAMP

-

Damaged trailer lamps

-

Damaged wiring harness

-

Loose or corroded connections

4. If fault is not visually evident, determine the symptom and proceed to the Symptom Chart.  See: Symptom Related Diagnostic Procedures

Trailer Lamps|Flow of Diagnosis|Page 8525 > < Trailer Tow Package Wiring|Page 8522