is the speaker wire ok? no bare spots? have you tried disconnecting the speakers from the amp and see if it still happens? try removing the speaker wire from the amp first, if it still goes out, try unhooking one terminal each from the speaker directly. if it is still going out, then you know it's not speaker/speaker wire caused.
have you tried going from the battery to the remote turn on? completely bypassing the h/u turn on. see if the amp lights that way. you might have to run a relay in line with the turn on, especially if you ae turning on multipule items.
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