F 250 4WD Super Duty V10-6.8L (2002)
Trailer Lamps: Initial Inspection and Diagnostic Overview
1. Verify the customer concern by operating the trailer towing package.
2. Visually inspect the following for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
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Central Junction Box (CJB) fuse:
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38 (20A)
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115 (40A)
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101 (30A)
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Circuitry
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Lamps
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Trailer tow turn/stop relays
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Trailer tow electric brake controller
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CJB
3. If the concern is not visually evident, verify the symptom and proceed to the Symptom Chart. See: Symptom Related Diagnostic Procedures
