jschildm
Member
I got a gentex mirror with the compass and temperature display on it. The wiring is pretty straight forward, connect a couple wires from the temp sensor, a positive, and a ground. The part I am curious on, however, is that there is a wire for a reverse signal. I believe it overrides the dim function whenever the transmission is in reverse. I did some searching and wasn't able to find a source in the cab for this signal. Does anyone know if there is one? My other options are to leave it be and see how it is without a signal to it, or run the wire out of the cab and splice into the wire running along the frame rail or coming from the range sensor. Do any of you have thoughts on this, or installed a similar style mirror?