I'm in the process of swapping out the original factory am radio with a Custom Autosound replacement. Does anyone know what the original factory radio wire colors are? Looks like a fairly easy job, just don't want to fry the radio.

 

I think the original radio just had 12V ignition going to it. Then it had a wire for each speaker and a wire for the accessory light. Shouldn't be too hard to figure out.

 

Yellow was the 12V switched feed, grey is the light feed, blue would be rear speaker + and cannot remember the front speaker + color (it should be the only wire left).

Note the original speakers had their - terminals grounded so make sure your radio can handle this. If it cannot, you would need to rewire the speakers to avoid radio damage. If you do that, new speakers with proper impedance would probably be best.