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Brake Controller Installation Trouble When Installing on a 1997 GMC Sierra Ext. Cab


I havea Reese Pod 83502 brake controller that we have tried to install in my 1997 Sierra ext cab and we seem to have either a faulty controller or wires wrong. We connected everything the way the instructions read and for some reason we are getting power coming out of the blue brake line all the time without the brake pedal being pushed. We have made sure that we have the correct line coming from brake relay so we know it only has power when the brake pedal is pushed. We have the ground wire directly hooked to the negative post of the battery. Is it possible I have a bad controller or something wrong with my wiring?

asked by: Gary

Expert Reply:

There is one old trick you can try before doing some testing to determine if the brake controller you have is bad. Take the manual activation switch and apply it fully several times, allowing it to snap back to the off position. If this solves the issue, the contacts for the manual slide were dirty and needed to be cleaned off.

If that does not solve the issue, test all of the wires going into the brake controller for proper function, constant power on the black wire, power, only when the brake pedal is pressed, on the red wire, white wire grounded and output on the blue wire. Sever the blue wire to test it so that none of the trailer wiring on the vehicle can affect the test. If the brake controller works normally with the wiring correct and the blue wire severed, your vehicle trailer connector or the trailer connector on the trailer could be wired wrong or have corrosion back-feeding power on the blue wire. If the brake controller still shows constant power on the blue wire, it is most likely time for a new one.

When testing the blue wire use a circuit tester, # 3808 if needed.

expert reply by: Bob G

Robert G

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