My friend had hooked up my stereo and needed a 12v source. So he hooked it up to one of the wires that goes to the airbag light on the radio bezel. well i unhooked the stereo from the harness since the wires werent taped, like he said. But when i plugged it up the next day nothing worked like it didnt have power and hooked it to another wire. But my problem is the a/c wont work and we think i blew a fuse but i didnt know what size the fuse is or where it would be located...plus my marquee is on but i cant change it when i hit the button.