Perhaps the dimmer wire got shorted? When you say the AMP powers up on startup, do you mean when the car is turned on, or when you try to turn on the radio? If the AMP turns on as soon as the key is turned whether the radio is on or off, then he wired it wrong or pinched a wire. There are a couple of sharp spots back there.
The first thing to do is to unplug and take out the head. Then make sure there are no shorts from the wires to the chassis. Once you get everything working (check fuses too), then try and put the radio back in.
KuoH
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