Constant Voltage on Brake Controller Blue Wire on a 2001 Chevy Silverado 3500
Question:
Have constant voltage at the trailer connection on the blue wire - 2001 Chevy Silverado 3500 Dually - wrong harness? If so, will changing the harness correct the problem or do I need a new controller? Thanks for your help.
asked by: Tom W
Expert Reply:
For the 2001 Chevy Silverado you should be using brake controller wiring harness # 3025-P. You will need to make sure that all of the wires in the back of the end that plugs into the truck are in the same location as in the picture I have included. If anything is different you will need to rearrange the wires, so they are in the proper locations.
If you still have problems, then you will need to test the brake controller to determine if it is the problem. In the truck cab you will need to sever the blue wire several inches from the back of the controller. Then use a circuit tester such as # PTW2993 to test the end of the blue wire coming out of the controller. It should only have power when you apply the manual override. If it shows power at idle, then there is something wrong with the controller and it will need to be replaced.
If it tests fine then reconnect the blue wire. Then move on to the truck side trailer connector. Many times, dirt or corrosion can cause a short in a trailer connector. Make sure the truck and the trailer side connectors are clean and free of corrosion inside and out.
You can test the brake output pin and it should only show power with the manual override. If it shows power any other time then there is a short somewhere between the connector and the brake controller you will need to track down.
If the truck side checks out fine then it could be the wiring to the brake magnets or the magnets themselves. Inspect the power wires to the magnets and look for pinched, frayed, or damaged wires and fix as needed. Make sure the ground wires are attached to clean and corrosion free bare metal surfaces.
Products Referenced in This Question
Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - GM
- Accessories and Parts
- Trailer Brake Controller
- Wiring Adapter
- Plugs into Brake Controller
- Vehicle Specific
- Tekonsha
more information >
Product Page this Question was Asked From
Tekonsha Voyager Trailer Brake Controller - 1 to 4 Axles - Proportional
- Trailer Brake Controller
- Proportional Controller
- Electric
- Manual Leveling
- Under-Dash Box
- Dash Mount
- Up to 4 Axles
- Indicator Lights
- Up to 90 Degrees
- Tekonsha
more information >
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