I just bought my 98' Expedition. When I turn the truck off, all my preset channels and clock go blank. It seems that the constant power to the head unit and my lighters is not working. What color wireis it on the back of the head unit and what fuse it is in the fuse box? I think it is just a fuse, but would like to test the wiring as well.
Thanks
jwrape

 

If its a stock radio, then it would have to be a fuse most likely.

 

Well, I just checked all the fuses last night.
THe guy that had it before me had a lot of stereo equipment in it, I wonder if he might have spliced something.
Does anyone know which color wire should have the constant power on? I'm pretty sure that it is a disconnected wire because my constant power to my rear cigar lighter is not working as well.

Thanks
Jwrape

 

try www.installdr.com

 

Well it almost helped. That Install DR. said that it strongly recommended using a install connector to install a new stereo because of the intergrated Amp in my system. It didn't actually list the wires for my system.
Unfortunatly, I am not installing a new radio but trying to get the original one to work correctly after a previous install of a after market unit.
But Thanks for the help anyway.

 

www.the12volt.com should have a wire color chart for the Expy.

 

Thanks I found it on 12volt.com

 

On most aftermarket radios, not sure if its the same with stock on expy but...
Yellow: Constant On (always connected for presets)
Red: Ignition turn on switch (turns radio on with turn of key)
Black: Ground
Blue/white: Power ant/ remote turn on wire (for use with amplifiers

The rest should be speaker, cd changers and sub output.
-Bill