Troubleshooting Trailer Running Light Circuit that Stays On all the Time
Question:
hello, I purchased the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56040. I installed it in my car and I recently noticed that my trailer lights tail and license plate lamp stay illuminated when the car is turned on and the harness is plugged in. I checked with my wifes car and the lights of the trailer turn off with the car. Is there something wrong with the wiring box system?
asked by: Shawn B
Expert Reply:
If you have LED taillights on your trailer and they are only partially illuminating then that is normal. If you have incandescent bulbs on your trailer and the light are fully illuminating then the problem is most likely the trailer harness on the vehicle.
Use a circuit tester to test the pin on the 4-way for the brown wire to see if there is voltage there at al times. Now test the brown wire going in to the converter box for voltage as well. If there isn't voltage going into the box on the brown wire but there is coming out then the box has shorted out and needs replacing.
I attached a help article on troubleshooting 4-ways for you to check out as well.
Products Referenced in This Question
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Powered Converter
- Custom Fit
- 4 Flat
- CURT
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Q&A: Troubleshooting 2012 Subaru Forester Curt T-Connector Not Sending Power to Trailer
- Q&A: Troubleshooting Wiring Harness On 2015 Subaru Forester When Trailer Lights Do Not Work
- Shop: Hook Probe Circuit Tester
- Shop: Trailer Wiring
- Video: Performance Tool Hook Probe Circuit Tester Review
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Video: Best 2012 Subaru Forester Trailer Wiring Options
- Video: Trailer Wiring Harness Installation - 2011 Subaru Forester 118467
- Video: Trailer Wiring Harness Installation - 2014 Subaru Forester
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Shop: Trimax Outboard Motor Lock
- Shop: Vehicle Tow Bar Wiring
- Search Results: modulite
- Search Results: 5 wire to 4 wire
- Search Results: 5 wire to 4 wire converter
- Shop: Tekonsha Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit
- Q&A: Troubleshooting Trailer Connection Getting HOT
- Q&A: Troubleshooting Trailer Running Lights Staying On when Vehicle is Turned Off
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Search Results: 90160
- Shop: Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Shop: Trailer Hitch
- Video: Choosing the Right Trailer Wiring
- Search Results: brake controller
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Article: Trailer Wiring Diagrams
- Shop: Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Shop: Brake Controller