CarpePoon
Hard-core CEG'er
The voltage would only be lower with the car on if your alternator is completely dead. In which case your battery/car would repeatedly die shortly after a jump start. Not much will cause a amp to go into protect other than heat, reversed polarity or a short. we know the amp is not getting hot, and if you have ruled out external shorting. My guess without seeing this first hand is that it must be internal.
I'm sticking with my original notion that you have a bad amp.
I'm sticking with my original notion that you have a bad amp.
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