deftones05

I just put my system in my car from the old one and I've had a bit of problems. Its a small system and only 1 10"sub and 1 amp powering the sub. The amp has power i've tried wiring the sub for r +, l - and r -, l + on the amp The sub setting on the deck is on and set to max The sub doesn't get a signal, doesn't hit at all Any ideas on what i can do next to figure out whats going on? Thanks alot

sub is a single coil 4 channel amp