help diagnosing mach460

revhead347 said:

It may not be getting power. The illumination is on a totally different circuit. The illumination is on the blue wire with the red stripe. I would pull the radio out and check both power circuits. There is a continuous power circuit, and another circuit for key on. Both circuits should have 12 volt power with the key in the on position. I don't remember the color of the wires specifically, but wiring diagrams are available on veryuseful.com. It helps to have the DIN removal tools to get the radio out. They used to sell those tools in the car stereo section at Walmart. Not sure if they still do.

Kurt

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Thanks for the response Kurt!

I was able to fabricate some DIN removal tools using a metal coat hanger. I found a diagram for the radio in the back of my Haynes manual.

Pulled the radio and started probing the electrical connections. My light green/yellow wire was hot at all times, and my yellow/black wire was hot when I had the key on. Looks like the radio is getting power. I think its safe to say my head unit is dead!

This leaves me with one question -- is it just the head unit or could my amps be dead as well? Is there any way I can test them using my test light, multimeter etc, even though my head unit is dead? That way I don't end up buying a new head unit and running into more problems later.

I appreciate any help/responses I can get!