Troubleshooting Trailer Lighting That Stops Working with Headlights On
Question:
OK, I got running lights.a good left turn signal,although i cannot get the right turn signal to work! i swapped lights so it is not a bad bulb and i have tried switching wires to no avail!! I do appreciate the prior answerand u were right about the bad ground! Thank U !!!!
asked by: John K
Helpful Expert Reply:
Your main problem is an insufficient ground for the trailer wiring. Try improving the connection of the main ground wire of the trailer wiring harness. Make sure it is attached to a clean metal surface. Or you can run all of the trailer wires back to the main ground. This is actually the ideal solution. But you can also check the current grounds for the lights to make sure they are making a solid connection to a clean metal surface.
What you described is the classic insufficient ground scenario so finding a way to improve the grounds will fix the problem. The issue is that when your headlights are on the maximum amount of amperage draw is put on the setup which if there's an insufficient ground this would be when this would show up.
Product Page this Question was Asked From
35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 31 Feet and Longer
- Plug and Lead
- 4 Flat
- Optronics
more information >
Continue Researching
- Q&A: How To Attach A Ground Wire To Trailer Frame
- Video: Spectro Wiring SWC502905-1 Review
- Shop: 35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground
- Video: Trailer Wiring Harness Installation A35W42B
- Video: Optronics Wiring - Trailer Connectors - A35W42B Review
- Shop: Peterson LED Combination Tail Light - Submersible - 7 Function - 6 Diodes - Square - Passenger Side
- Shop: Quick Splices - Self-Stripping Connector - Closed Port - 14-16-18 Gauge - Blue - Qty 1
- Shop: Deka Heat Shrink Butt Connector - 22-18 Gauge - Nylon Insulation - Red - Qty 5
- Shop: Peterson LED Combination Tail Light - Submersible - 8 Function - 7 Diodes - Square - Driver Side
- Shop: Custer Rubber Grommet for 6-1/2" Long Oval Trailer Lights
- Shop: Combination LED Trailer Tail Light - Submersible - 7 Function - 14 Diodes - Driver Side
- Q&A: Gauge of Wiring in 35 Ft 4-Way Trailer Wiring Harness # A35W42B
- Video: Choosing the Right Trailer Wiring
- Search Results: 25580
- Article: Trailer Wiring Diagrams
- Shop: Trailer Hitch
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Shop: Trailer Wiring
- Search Results: safety chains
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Search Results: equalizer
- Article: Most Popular Wheel Bearings
- Shop: Brake Controller
- Video: Timbren Axle-Less Trailer Suspension System Installation
- Video: Choosing the Right Brake Controller
- Search Results: l44649
- Shop: Gooseneck Hitch
- Q&A: What Gauge Wire does 4-Way Trailer Wiring Use
on Trailer Wiring
John P.
6/18/2021
OK, I got running lights.a good left turn signal,although i cannot get the right turn signal to work! i swapped lights so it is not a bad bulb and i have tried switching wires to no avail!! I do appreciate the prior answerand u were right about the bad ground! Thank U !!!!