Brake Switch Wirng

By Bruce123
March 28, 2011 in 1999-2013 Silverado 1500 & Sierra 1500

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Bruce123

Posted March 28, 2011

We tow our 09 Silverado behind our motorhome. I have a US Gear brake system that I would like to install. I have done this many times. This system applies the brakes on the Chev when the brakes are applied on the motorhome. Part of the wiring requires that you interupt the hot wire to the brake switch. Unlike some other vehicles there are 4 wires to the brake switch. light purple, dark purple , blue and white. I could just use a test light to determine the hot ( 12 volt source) wire but the switch is hard to get at. Can anyone tell me which wire is hot all the time? Thanks.

Bruce

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