Lights Flash, Don't Work or Dim with Trailer Wiring Harness Installed on a 2009 Toyota Tacoma
Question:
Part 118496:I bought this part number a while ago for my 2009 Tacoma. Now I have a problem with my light not working properly. Im not sure what is wrong with it. But when my headlight is on, and if I press the brake, the interior light will flashing and dim. When I turn the signal left and right, all my signal light is flashing. So I unplugged the T-connector and looks like it back to normal. Can someone tell me what is wrong with this issues?
asked by: Kao V
Expert Reply:
This sounds like a ground problem. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light.
Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces.
The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.
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
- Video: Trailer Wiring Harness Installation - 2008 Toyota Tacoma
- Shop: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: Trailer Wiring
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Video: etrailer Trailer Hitch Receiver Installation - 2012 Toyota Tacoma
- Article: Trailer Tire Sizing
- Q&A: Best Speed Rating for a 4.80-12 Trailer Tire
- Article: How to Choose the Right Trailer Hitch Class
- Q&A: How to Determine if Wheels Can Withstand 110 psi Rating for New Tires
- Q&A: What is the Difference Between a 4-Way and 7-Way Trailer Connector
- Q&A: Upgrading Toyota Tacoma from 4-way Flat to 7-way Round Trailer Connector
- Q&A: Black Slide Topper For 188 Inch, 159 Inch, and 74 Inch Flange to Flange Measurements
- Q&A: Replacement Trailer Brake Assembly for B12EA-22 on 2018 Forest River 294BH Travel Trailer
- Q&A: What Do Old Warner Trailer Brake Assemblies Look Like
- Article: Determining Trailer Tongue Weight
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Article: Trailer Wiring Diagrams
- Article: Trailer Maintenance Schedule
- Article: Can You Flat Tow a Ford Escape?