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Stoplight Switch Wire Color for Installing Brake Controller 1998 GMC Truck


where do you hook red wire from controller to the brake switch


Expert Reply:

Typically the wire color you would be looking for on the brake switch of your 1998 GMC truck will be white. But you will need to use a circuit tester like part # PTW2993 to verify that the wire has 12 volts when the brakes are applied and none when released.

I attached an install video that shows a brake controller install in a similar truck as yours.

expert reply by:
Jameson C

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