I'm trying to wire my wifes Tahoe for a trailer so I can use it as a tow vehicle for the ol Jeep. Problem is the last owner has already had it rigged and had 5 different plugs wired... literally, but NONE of them worked. I bought a plug and play plug from the parts store and ripped out everything the guy had wired, then re-wired the few wires that were disconnected. Plugged the harness in and hooked up the trailer. I have brake and turn signals but when I push on the brakes and turn on the turn signal they both flash. It does the same thing when I turn on the headlights without the brakes pressed. When I have the headlights on and push the brake all the trailer lights go out. All the lights on the Tahoe itself work find. Any help here? Thanks!!!!