i was installin an aftermarket radio on my girlfriends 97 sable and i ranned all the speaker wires to the front. I also ranned all the amp cables. I grabbed my constant, switch and ground wire from the front cables for the a/c (or so i think) anyways everything was workin fine a/c was blowin cold and radio was turning on.... but after installin the aftermarket radio in its full my a/c and illumination on stock dont work.... the front defrost turn on every time i turn the car on but wont turn off....checked fuses and all are fine.... what could be the problem?