Hello - looking for some help on electrical. I have a 68 Camaro that was rewired with an American Autowire Classic update kit. Aftermarket Kenwood stereo with 4 speakers and a matching Kenwood power amp in the trunk. Was doing some interior work like changing the steering wheel and swapping out the dash lights with colored LEDs and radio suddently stopped working. Big 50 amp Buss fuse for the power amplifier (just off the battery under the hood) was blown. I've replaced that fuse and power amp is now reading 12V from power/ground but no voltage from PConnector wire (from head unit telling the power amp to turn on). Fuses on the radio and power amp are all fine. I pulled the Kenwood head unit and there is 12V to ACC red wire with the key in position, but no voltage to constant 12V yellow wire at the harness (in any key position). Directly probing the fuse box, I get zero V at the radio fuse...completely dead.

If I can read 12V from the red ACC + ground, I would assume that means the ground is ok? What could possibly interrupt the 12V constant? Everything else in the car seems to be working fine...dash lights, console gauges, blinkers, brake lights, etc. Just seems to be the radio and it's driving me crazy.

Some of the forums suggest changing out any relays, but this AA kit only seems to have 1 relay in it and that's for the horn (which still works). Another friend told me to swap out the ignition switch and see if that solves it but the car starts fine and there's no other problems beside the radio. Is there something else obvious that i'm not seeing here?

Would greatly appreciate any help offered! Thank you

 

A few WAGS...if you popped a 50 amp fuse something serious is going on. I would suspect during your interior work maybe something shorted out or perhaps the power amp went bad and did some other damage. Did you disconnect the battery when you were working on the car? When you say no power to the radio fuse I assume both sides of the fuse so are you sure the radio was hooked up to that circuit or maybe it is somewhere else? If somewhere else is there an inline fuse in the harness wiring to the radio for power? Does the new and/or any existing harnesses have any fusible links that might be blown? Good luck!