Remote Wire Hookup..

Yeah, another remote wire hookup thread.. I can't find a solid answer..

I have a stock headunit...

I wired my Lightning Audio amp up with my Alpine Type S sub and everything is complete except for the remote wire. I jumped the remote wire/power wire to test, and everything is working correctly (thank god). I just cannot find a good 12V power source for the remote wire. I tried hooking it up to the radio fuse, but it still keeps the amp on even if the car is off.

Is my best bet pulling out the stock h/u and hooking it up to the ignition wire?

Thanks!

alright, I think that's what I'll do. Now I hope I have my factory head unit 'keys'...