i installed 6.5 inch kickers in my 2008 subaru legacy. the hu was not enough to power them so after installing a scosche loc to add rca's. i then installed a small amp to power the rear door speakers. ***Problem is that i merely tied into the rear door speaker wires leaving a connection back to head unit. thought something wasnt right and somehow talked myself into trying it anyway. when i turned on it made a couple nasty sounds, i smelled burnt wires then hu shutoff. now i have no power in car at all. wont start wont do anything!!!! what have i done???