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How to Find Brake Switch Wire on a 2003 Chevy S10 for Brake Controller Install

Question:

Im installing a trailer bake controller in a 2003 Chevrolet S10 ZR2. I have all of the wireing done except I cant figure out which wire to conect the stoplight switch lead to. There is a Black, White, Dark Green, Light Green, Light Greem w/ Stripe, Purple, and Purple with a Purple Flag all going to the switch. What collor would the cold side of the stoplight switch be.

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Expert Reply:

In order to determine which of the wires coming from the stoplight switch of your 2003 Chevy S10 should be used to install a brake controller you will need to use a circuit tester like part # PTW2993 to test the wires till you find one that sees voltage when the brakes are applied and none when they are released. We don't have specific wire color info for your vehicle, but testing the wires will be pretty easy and will tell you which one to use.

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Jameson C

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