1993 Chevy / GMC
Trailer Brake Controller Install
(actually in a 1993
Chevy 3/4 ton 2500 Diesel)
(Other years may be the
same)
"Standard" Wire colors to the
controller (Tekonsha and others):
Black, Battery Positive to controller
White, Negative Ground for Controller
Blue, Brake feed from controller to
Trailer plug at back of truck
Red, tap into truck Brake light switch
signal to tell controller to apply brakes
Remember, the above colors are just a
GUIDE. your colors may be different, read the
instructions!
We found the brake light switch tap on
the long connector attached to the steering column. It was
the white wire, second or third from the end (from the
back of the truck) The picture shows looking up from
the floorboard.
Get a test light and test all the
un-used pins on this plug, looking for the one that lights
up when you press the brake pedal. If you can not find any
that light, you will forced to find the brake light switch
wire under the dash. The brake light switch is very hard
to reach, but with a probe tester, look for a wire under
the dash that lights with the brake lights. I you are
probabally looking for a small gauge white wire (seems
most GM trucks of this era used white). Tap into the
wire for the brake light feed (red wire on most
controllers)
For power, we ran a wire through the
firewall, and tapped onto the fuse panel under the hood.
We grounded the controller under the
dash to a ground screw. Easy.
The blue (brake wire to plug) was
simply passed through a hole in the firewall and ran along
the frame to the back plug on the truck. (making sure to
use lots of tie wraps to keep the wire awy from hot and
moving parts)
We have found on some trucks, the wire
to the backs of the truck is way down under the brake
master cylinder: