Troubleshooting Factory Trailer Wiring for 2003 Ford F250
Updated 12/03/2014 | Published 12/02/2014
Question:
The 7 spade plug on the truck I get clearance lights to work. The turn lights and brake dont work. I check the factory plug and the only thing I can get is power and clearance. Where might my problem be if not getting any turn or brake out of the factory connector?
asked by: Jason
Expert Reply:
First I recommend cleaning the connector and make sure there is no corrosion on the pins. Check the wires at the back of the plug. You may need to remove the wires from the connector as corrosion can build up in the connector. If all of the connection points are corrosion free, then begin testing the wires themselves.
Since you are not receiving a signal on some of the pins I recommend tracing those wires back till you find a point where the signal is active. It may be that connection points between the wiring harness and the vehicle wiring are bad.
I would also recommend checking for any blown fuses if you have the tow package. I have attached a wiring article for you to review while troubleshooting your wiring harness.
I would also recommend checking the ground connections on trailer for the lights and trailer connector and the ground connection point on the vehicle wiring harness. Faulty ground connections can cause different issues with trailer lighting.
Product Page this Question was Asked From
Pollak Black Plastic, 7-Pole, RV Blade-Style Trailer Socket - Vehicle End
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- 7 Blade
- Plug Only
- Pollak
more information >
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Brake Controller
- Shop: Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness - 1 to 4 Axles - Proportional
- Shop: Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In
- Q&A: Wire Diagram for Installing a Voyager Brake Controller on a 2002 Ford F-250
- Video: Curt Brake Controller C51322 Review
- Q&A: Troubleshooting Tekonsha Prodigy P2 Brake Controller that Doesnt Recognize Trailer
- Shop: Curt Pintle Hook - Bolt On - 60,000 lbs
- Shop: Suspension Kit for Tandem-Axle Trailers - 1-3/4" Wide Double Eye Springs - 2-1/4" Links
- Shop: Suspension Enhancement
- Video: Install: Timbren Rear Suspension Enhancement System on a 2002 Ford F-250 and F-350 Super Duty
- Q&A: Troubleshooting Lack Of 12V Power On 7-Pin Trailer Connector When All Other Functions Work
- Q&A: Troubleshooting Error Codes SH and OL on a Tekonsha Prodigy Brake Controller
- Q&A: Install Instructions/Video for Timbren Kit on a 2001 Ford F-250 4WD
- Shop: Timbren Rear Suspension Enhancement System
- Shop: SumoSprings Custom Helper Springs - Rear Axle
- Shop: Curt Heavy Duty D-Ring Tie Down - Weld On - 6" Wide
- Q&A: Troubleshooting Green Light on Brake Controller Stays on Without Braking
- Search Results: air springs vehicle suspension
- Search Results: timbrin
- Q&A: Tricking P3 Brake Controller Into Showing Connection to Trailer Brakes to Allow Programming
- Article: Trailer Wiring Diagrams
- Shop: Trailer Hitch
- Search Results: trailer hitch
- Shop: Trailer Wiring
- Search Results: trailer wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: How to Choose a Trailer Brake Controller
- Search Results: trailer tires and wheels
- Article: How to Measure for Trailer Hitch Drop
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
on Custom Fit Vehicle Wiring
