Tekonsha Voyager Trailer Brake Controller Works Intermittently on 1999 Chevy Suburban 1500  

First, I have constant power on blue wire of brake circuit at the 7-way plug when metering from the blue pin to ground. It gets worse. With my trailer plugged in, the application of the brake pedal usually causes the green LED to go out completely, unless it decides to work that day. The manual override works every time, EXCEPT when the head lights are on, then NOTHING works. Now, when I turn on either turn signal and apply the brake pedal, the unit functions and applies the trailer brakes. The green LED turns orange, but blinks along with the turn signal, but if the head lights are on, then nothing works, not even the manual override. I had this professionally installed a little over a year ago and it hasnt worked right since. I took it back and they supposedly replaced the controller unit. They did not ground the 7-way receptacle to the frame. I fixed that. The tag on the white wire coming out of the controller says to connect directly to the battery. They did not. I fixed that too. My trailer is brand new right from the factory a year ago and is not rusty. All the lights works perfectly and there is no corrosion in the plug. In my fuse box under the hood there is a port labeled Brake Lamp Relay. Is this the port I keep reading about that takes a special harness for this system? The only wire I cant verify what it is is the white wire under the dash in one of the harnesses that they connected the red wire to gets the signal from the brake pedal. I cant see the brake pedal switch to trace the wires out as I cant get my hand up in there or see up under the dash. Please help me. I am at a loss and the way this system is acting doesnt make sense.

asked by: Paul P