Got the unit installed in my 97 F150. There is an orange (dimmer) wire on the factory adaptor harness, but no illumination wire. I had to run a wire over to the headlight switch and tap into the white/red wire. I left the parking break floating (my truck is a stick). I didn't get the bypass module yet. But I did try the 1 flick of the parking lights and it does work. I love this thing. I haven't used the nav yet. Just put it on map mode while I was driving around and it is dead on to where I'm at. Like if I come up to an intersection or something, the arrow is right there where I am a