Hi need some help. I wire in a Jensen cd /fm radio in my 96 z3, but the music doesn't play. Can anyone give me a clue, the radio powers up, gets a signal, but the speakers don't seem to work. I even replaced the 5" speakers as one was old and torn. But haven't a clue. Does BMW run through a pre amp from the factory radio. Also how about the alarm system, or the blinking red light on the radio haven't got a clue on this either does it actually do anything. I once thought I could fumble my way through the ins and outs on cars but the Z3 is proving to be a challenge. Any help would certainly be much appreciated, driving is great especially since the weather is in the 70's, but with no music it does get depessing. Tks G