I have an aftermarket alpine in my 91 jeep today didn't want to power on. All fuses are good everything is good I'm getting power just no display illumination. Called alpine they said it's dead I should send it for repair. But when I put the stock stereo in to at least have something to listen to the display on the stock stereo was no good either however I can hear music and I can cycle through radio stations. This has me thinking maybe an illumination wire is bad somewhere anybody have any ideas?

 

Most of our jeeps have a separate wire for display, operates in conjunction with dash lights to dim or brighten.
Do you have a wiring schematic that defines the jeeps radio wires?

 

look it up.....

http://www.the12volt.com/

 

Illumination is controlled by headlight switch. If it is turned clockwise, display goes dark.

 

2 junk head units, time for new.

 

The display on the stock unit is not lighting up at all even when turning the switch. Everything else does light up though like the numbers and settings on the unit.

 

The alpine is fairly new and I find it odd that 2 units that were working perfectly fine both fail with the same problem.

 

You have power to orange and black on factory harness ?


http://www.the12volt.com/installbay/...tail/1150.html

 

Not on the jeep harness I do have it on the harness adapter but there is no wire to match to the alpine harness. I have a plug and play harness and all the wires are color matched. It used to power on and work perfectly fine this just happened out of the blue I didn't even mess with anything.

 

So i found out that the stereo is fine. I ran a power test and ran the stereo straight to the battery and it powered up fine. I'm very close to running the stereo to a switch straight to the battery but this is last resort. Still messing with wires to see if I missed anything.

 

Does dimmer work when turned at headlight switch .

 

It works and with the factory stereo it lights up the settings just not the lcd display. The alpine doesn't power on at all.

 

Is this your wiring colors....

 

Just by pass harness. Go from alpine harness to xj wiring harness using scotch lock bypass adapter.

 

The problem is in the jeep wiring. Everything is clean but the wires all have these blue connectors as if it was cut before it's obviously been tampered with.