Instrument Back-lighting mystery
I had my TJ for three year now, and I've had one persistent problem being that the back-lighting in my instrument cluster and A/C controls have not worked for as long as I have had it. I have checked and rechecked every fuse, connector, wire, switch, light bulb, relay and ground in the dash and under the hood. From there I replaced my multifunction/ dimmer switch, but that also didn't work. When I first bought my Jeep the previous owner had hastily installed a JVC head unit, which I rewired, however it still has three unused wires orange (dimmer), light blue (power ant.?), and brown (not matched to a wire on the factory radio plug) I don't thing these wires would cause my problem, but I could be wrong. One other thing I noticed is my TJ doesn't have a security bracket or large radio ground wire behind the radio, possibly due to it being a 2003, but I'm not sure about that either. Any help or ideas would greatly be appreciated. Other wise I would have to believe the previous owners alien encounter/ abduction story.