Has anyone used the TAP electronic brake controller on their trucks. I installed one (new) and getting an intermittent first led light on on the controller. Tried another new unit on other trucks and it is still doing the samething on the others too. 1. 04 volts output at the tow connector. Is this enough to worry about or should I use the Drawtight Activator out of my other vehicle? Or any others that you would suggest.