ford Workshop Repair Guides

Ford Workshop Service and Repair Manuals

Initial Inspection and Diagnostic Overview|Page 10154 > < Diagram Information and Instructions|Page 10151
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Trailer Lamps: Initial Inspection and Diagnostic Overview

INSPECTION AND VERIFICATION

1. Verify the customer concern.
2. Verify the exterior lighting system of the vehicle is operating correctly. If not, refer to the appropriate pinpoint test.
3. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
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Battery junction box (BJB) fuse(s):
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(20A) (trailer tow parking lamps)

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24 (15A) (trailer tow LH stop/turn relay)

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46 (15A) (trailer tow RH stop/turn relay)

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Wiring, terminals or connectors

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Trailer tow stop/turn relays

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Trailer tow parking lamp relay

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Trailer

4. If the concern is not visually evident, verify the symptom. GO to Symptom Chart.  See: Symptom Related Diagnostic Procedures

Initial Inspection and Diagnostic Overview|Page 10154 > < Diagram Information and Instructions|Page 10151