I just put mine in. I bought a Prodigy brake controller. The controller is easy to install. For mine the red wire went to the switched side of the brake pedal(the wire that only has voltage when you step on the brakes), a black wire for power. I added a 30 amp auto reset circuit breaker. A white wire for grounding. And a blue wire to give the braking signal to the trailer. On the 7 spade side it had the brown, yellow, and green wires that were conected to the exsistig 4way for tail and turn signals. White for chasis ground. Purple for reverse lights. Black for 12 volt source.( here I used a 87a relay that used a swited signal source from the ignition and the 12 volt source was taken from the in bed cigerete lighter thing. And a blue wire that connected to the blue wire from the brake controller. Let me know if you need any picturs to help you out.
