Symptom Chart

WARNING: This page is about a different car, the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM CHART

Condition	Possible Sources	Action
The Trailer Lamps Are Inoperative	Trailer harness connector.	INSPECT trailer harness for signs of damage or corrosion. REPAIR as necessary.
The Trailer Lamps Are Inoperative	Circuitry.	CHECK vehicle trailer harness for a good ground connection. If ground is OK, REPAIR trailer lighting system.
The Individual Trailer Lamp Is Inoperative - RH Trailer Turn Signal/Stoplamp/Hazard Lamp Flasher Inoperative	Bulb. Circuitry.	GO to PINPOINT TEST W: THE INDIVIDUAL TRAILER LAMP IS INOPERATIVE - RH TRAILER TURN SIGNAL/STOPLAMP/HAZARD LAMP FLASHER INOPERATIVE .
The Individual Trailer Lamp Is Inoperative - LH Trailer Turn Signal/Stoplamp/Hazard Lamp Flasher Inoperative	Bulb. Circuitry.	GO to PINPOINT TEST X: THE INDIVIDUAL TRAILER LAMP IS INOPERATIVE - LH TRAILER TURN SIGNAL/STOPLAMP/HAZARD LAMP FLASHER INOPERATIVE .
The Trailer Lamps Are Inoperative - Trailer Parking Lamps	Fuse. Circuitry. Trailer tow relay.	GO to PINPOINT TEST Y: THE TRAILER LAMPS ARE INOPERATIVE - TRAILER PARKING LAMPS .
The Trailer Lamps Are Inoperative - Trailer Backup Lamps	Fuse. Circuitry. Trailer tow backup lamp relay.	GO to PINPOINT TEST Z: THE TRAILER LAMPS ARE INOPERATIVE - TRAILER BACKUP LAMPS .
The Trailer Battery Charging Is Inoperative	Fuse. Circuitry. Trailer tow battery charge relay.	GO to PINPOINT TEST AA: THE TRAILER BATTERY CHARGING IS INOPERATIVE .