I have no brake light and the brake wiring is hidden by the gas tank in the back of the vehicle..
SOURCE: 1999 chevy tahoe 5 wire trailer wires, what does each color do?
Yellow is the left turn signal, White is ground, Dark Green is the right turn signal, Brown is the running lights and brake light, the others are for the electric brake set up for the trailer.
SOURCE: 2009 chevy expres trailer wiring harness
Ask dealer if it has a towing package on it. If it does, you usually just pop fuse in under hood for electric brakes, and harness to adapt into is usually near or at rear bumper. Even if it doesn't have brake wire, you should still be able to install adapter at rear,for lights etc. which is available from dealer or auto supply places, then you may have to run electric brakes separate.
SOURCE: 2007 Chevy Express Trailer Wiring
on most new trucks there is a wiring harness that has a cover over it that you plug a extension into. Look for that first. If you can't find it I would go to the dealer and ask them to make sure that you don't cut wires you don't have too and end up with a mess.
SOURCE: 2000 Chevy Astro van rear ac
astro van 2000 rear a/c switch
large orange power 13.8 volts pin G
small orange pin A
blue pin B
not used pin C
not used pin D
gray pin H
yellow pin F
black pin E
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