Trailer Tail Lights and Running Lights Do Not Work When Connected to 1994 Ford Ranger
With the connector installed, the vehicle lights work properly. The brake lights on the trailer work, the tail lights and turn signals do not work. Do you have a suggestion to fix my problem?
asked by: Duane W
This is a strange situation because on a trailer, the brake lights and turn signals are on the same circuit. Unless your trailer has turn signals that are separate, it should be a standard 2 wire system. What may be occurring is a bad ground, a alternative wiring situation on the trailer, or a bad converter box.
First, testing the converter is simple. Start by disconnecting the trailer. Next, use a circuit tester like # PTW2993 to first test the signals going into the converter and then coming out of the converter. If the signals are correct going in but not coming out then the problem is ion the converter and it will need to be replaced.
Checking grounds is the next easiest thing to check. Start at the trailer side connector and make sure that the main ground is attached to a clean and corrosion free metal surface. Work your way back to the taillights and make sure each of them is also attached to a clean and corrosion free bare metal surface.
If the trailer has a plastic license plate holder, this can cause ground problems. If the trailer connectors have corrosion, clean them out because corrosion can cause a bad ground or connection as well.
Determine how the trailer is wired. It should have one wire going to each taillight that carries the brake and turn signals, and another wire going to each light that carriers the running lights. On the harness, the white wire is ground, the green wire is right turn and brake, the yellow is left turn and brake, and the brown wire is running lights.
These are the most likely issues that could be causing the problem. I have included a link to our FAQ article on wiring that does include some information on troubleshooting for you.
Products Referenced in This Question
- Electrical Tools
- Circuit Tester
- Performance Tool
more information >
Featured Help Information
- Q&A: Does Draw-Tite Trailer Hitch 13091 Require Drilling to Install on 2001 Ford Ranger
- Q&A: How to Install a 4-Way Trailer Connector on a 1994 Ford Ranger Truck
- Q&A: Recommended Trailer Hitch Receiver for 2004 Ford Ranger Edge
- Q&A: Distance from Mounting Surface to Bottom of Draw Tite Hitch part # 75082
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Article: Best Boat Accessories
- Q&A: How to Wire a Towed Vehicle With Seperate Turn and Brake Cicuits on Towing Vehicle
- Q&A: How To Install 7-way Connector On 2010 Chevy Express Van 3500 Without Factory 7-way Connector Plug
- Q&A: Connecting Brake Controller Wiring on 2019 Chevy Express Van 3500
- Article: Breakaway Kit Installation for Single and Dual Brake Axle Trailers
- Article: Towing a Trailer? Let's Talk About Brake Controllers
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Stability Control for Heavy Duty Vehicles