Troubleshooting Right Side Trailer Lights Not Working, Left Side Working Correctly
Updated 08/21/2024 | Published 02/12/2011
Products Featured in This Question
Question:
have a problem hitch plug. everything on the left side works but nothing on the right. i have checked and tested every fuse and all is good. any ideas
asked by: Dawn
Expert Reply:
Most trailer wiring problems are the result of a bad ground. What I would do is start with the connectors. Maker sure the connectors on both the trailer side and vehicle side are free of dirt and corrosion and that they are properly grounded.
Next, I would move on to testing the vehicle side connector using a circuit tester like # PTW2993. Since the right side is not working, you will want to test the pins of the connector for right turn and brake. If looking at the face of the connector, it is the pin in the 3 o'clock position. If you are getting the proper signal at the connector, you know that the problem is on the trailer side.
On the trailer, make sure the main ground is connected to a paint, dirt, and corrosion free bare metal surface on the frame. With the trailer connected , you can test the wiring behind the plug with a circuit tester to verify the signal is getting through. If it is not, then you know there is something wrong with the trailer side connector.
If the signals are getting through, you can move on to checking the wiring back to the lights looking for an broken wires or loose connections. Trailer lights usually ground through their mounting studs unless a ground wire is present. These ground connections should also be free of dirt and corrosion
Product Page this Question was Asked From
Pollak Replacement 7-Pole, RV-Style Trailer Connector 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
- Article: Trailer Wiring Diagrams
- Shop: Hook Probe Circuit Tester
- Search Results: lift handle
- Search Results: hitch pin
- Search Results: transom saver
- Q&A: Trailer Lights Left Side Turn Signal and Brake Lights Not Working
- Q&A: Troubleshooting Trailer Taillights Where Only One Side of Trailer Lights Work
- Q&A: Troubleshooting Right Side Turn Signal Not Working On Trailer
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Q&A: Left Side Trailer Lights Not Working With New LED Trailer Lights Installed
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: Curt Replacement OEM USCAR Trailer Connector - Dual Connection - 7-Way RV Style and 4-Way Flat
- Search Results: trailer lights
- Video: A Closer Look at the Hook Probe Circuit Tester
- Q&A: Replacement Motor Support Toggle For Old Transom Saver
- Video: Installing the Curt Replacement OEM USCAR Trailer Connector on a 2024 Ford Bronco
- Search Results: bike rack lights
- Shop: Optronics LED Combination Trailer Tail Lights - Submersible - 40 Diodes - Driver and Passenger Side
- Video: Tourney Pro Transom Saver Feature Review
- Shop: Curt Trunnion Style Weight Distribution System with Shank - 10,000 lbs GTW, 1,000 lbs TW
- Search Results: a35w42b
- Search Results: trailer wiring
- Shop: Optronics LED Clearance or Side Marker Light - Submersible - 3 Diodes - Rectangle - Amber Lens
- Shop: CE Smith Spool Roller Assembly for Boat Trailers - Galvanized Steel and Black Rubber - 4"
- Q&A: Working Running Lights, But No Turn Signals or Brake Lights On Trailer
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
- Video: Comprehensive Review: Curt Replacement OEM USCAR Trailer Connector
- Video: Setting up the Curt Trailer Hitch Receiver on your 2023 Chevrolet Colorado
- Video: In-Depth Review of the Fulton Boat Trailer Jack w/ Wheel
- Video: A Closer Look at the Fulton Bolt-Thru Swivel Marine Jack
on Custom Fit Vehicle Wiring
Brett P.
6/22/2020
I have led light on my trailer all the lights work accept the drivers tail light why is that