How to Easily Determine if Converter of Trailer Wiring Harness is Bad
Question:
I have purchased through eBay and installed a trailer light wiring harness on my vehicle, but only the turn signals work. I don’t know what’s wrong with it. I believe it was claimed to be new and unused, but enough time has passed that I can no longer contact the seller for assistance. My question is whether you believe that this Mopar adapter could be diagnosed and possibly have wiring changed on plug-in connectors that may not be exactly right for my vehicle, or whether it would be quicker, easier and more economical just to start over with a new harness from a reputable online retailer like etrailer.com for try again.
asked by: James W
Expert Reply:
To troubleshoot whether or not a trailer wiring harness converter box is functional you just need a circuit tester like part # PTW2993 to test for voltage on all of the circuits on the input side of the box and then if they are all there then test the output side. If the box is bad you'll find voltage on the input side but none on the output side. At this point it would be best to replace the entire setup with something like the Curt # C55376.
Products Referenced in This Question
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Converter
- Custom Fit
- 4 Flat
- CURT
more information >
Product Page this Question was Asked From
Featured Help Information
Instructions
Continue Researching
- Article: Trailer Wiring Diagrams
- Q&A: Trailer Running Lights Do Not Work but Brake Lights and Turn Signals Do Work
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Brake Controller Installation: Starting from Scratch
- Article: Testing Trailer Brake Magnets for Proper Function
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: Troubleshooting Brake Controller Installations
- Q&A: How to Make an Adapter to Go from Semi Truck 7-Way Round to RV Style 7-Way Blade on Trailer
- Q&A: Will The Curt Dinghy Wire Harness # C96JR Interfere With Activation Of A Blue Ox Patriot
- Q&A: Trailer Turn Signals Both Blink when Just Left Turn Signal is Activated
- Q&A: Trailer Lights Left Side Turn Signal and Brake Lights Not Working
- Q&A: Troubleshooting No Running Lights on Trailer but Turn Signals and Brake Lights Work
- Q&A: Troubleshooting Lack of 12V Power at 7-Way Trailer Connector on 2019 Ford F-150
- Article: Trailer Lighting Requirements