"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!

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Picture is of Bulk head wire connector under dash.

We tapped into the WHITE wire with the Tan tracer for the brake light signal (red wire on the controller) Test to be sure, it must power on when the brake pedal is pushed.

Battery feed was taken from the battery (under the hood)

The Ground wire (white) was grounded under the dash (see screw in picture )