Troubleshooting No Power to Blue Wire When Brake is Applied on the 2007 Chevrolet Silverado Classic

Updated 07/20/2018 | Published 07/19/2018

Question:

so trouble shooting per your articles and i have the 3015 plug and the wires are in the right place, but with 12v tester there is no power to the blue wire. so how do i remedy that?

asked by: Roger B

Expert Reply:

Not to worry, this is a common issue and I will be happy to help you get the blue wire working.

The blue wire is the output wire from the brake controller. It is only activated when the brakes are pressed or the manual override is activated. There has to be constant power on the black wire and on the red wire when the brake pedal is pressed for the blue wire to function properly.

If you are using a proportional brake controller like # 90195 and are only testing the blue wire with the brake pedal the blue wire may not show power. This is because this kind of brake controller has to sense actual braking force (while towing) for the blue wire to activate.

If the black wire and red wire are functioning properly and you are testing the blue wire with the manual override switch and you still aren't receiving power, then that would point to a faulty brake controller that would have to be replaced.

If this does not solve the problem, contact me back and we will explore some other options.

expert reply by: Timothy G