Troubleshooting Trailer Lights Not Getting Power On Vehicle Side
Question:
I have a 2008 Highlander that we had trailer lights hooked up. They worked for 3 years and now we are not getting any power to the OEM harness on the vehicle side. We have checked the fuses that the manual say go to the towing package and they are fine. Any other suggestions?
asked by: Susan S
Expert Reply:
From what you've shared it sounds like the issue is squarely on the vehicle side. If you've already ruled out a fuse being the cause, next I would use a circuit tester # PTW2993 at the plug where your harness connects to. Included is a video showing how to do this. If the functions are working as they should, you will need a new harness. The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # 56042 is a solid option to consider if you need.
If you identify the problem there during your testing and you've already ruled out the fuses and relays, you likely have a damaged wire on your Highlander and shop would be your next stop.
Products Referenced in This Question
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 4 Flat
- CURT
more information >
Product Page this Question was Asked From
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Converter
- Custom Fit
- 4 Flat
- Tekonsha
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Parts Needed to Add Brake Controller to 2010 Toyota Highlander
- Q&A: How To Determine if the 2018 Toyota Highlander Has A Tow Package For Trailer Wiring
- Article: My Trailer Hitch Doesn't Fit
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: Parts Needed to Install 7-Way and Brake Controller 2024 Toyota Grand Highlander
- Q&A: Aero Bar Roof Rack that Fits 2022 Toyota Highlander
- Q&A: How to Determine if a 2017 Toyota Highlander has a Factory Tow Package
- Q&A: Wiring Diagrams for Hydrastar Electric Over Hydraulic Trailer Brake Actuators
- Q&A: How to Tell if 2019 Toyota Highlander Has Factory Tow Package
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: RV Pre-Departure Checklist
- Article: How to Measure for Trailer Hitch Drop
- Article: Routing the Power Wire for a Trailer Wiring Harness