you should have a remote output form your headunit. if u havent already, that should be connect to the amp, following on from what EuroDude.
and about you Headunit turning off once in a while, im thinking itz a grounding problem. same thing happened when i frist installed a HU into a friend's camry. didnt ground it properly so wen i turned up the HU to a point it would just turn off till the HU is started up again. so what you should hav is an independant think ass mother wire that connects straight to the closest point on the chasis's naked metal
and since you were pumping your system without the car on, id say ur bat is dead. If you can hear your car turning over, then its sometihn else.
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