ok, I used an adaptor for the stock harness so the ground should be fine. The amp is grounded as well. It works for the first 15 min then stops, so it has to be some sort of protection. Someone segested to install a relay, but i dont know on wich of the 2 wires. Then I called Alpine and asked them, they said there is a stock amp somewhere that is being tuned on causing the problem (I dont think that is the case, '95 instegras dont have amps, as far as i know)
so what could it be, would the relay really be needed?
how do I chek for over current draw?