Hi Tear,

Sorry to say it, but I think your on a slippery slope.

I agree that it is really fun to play and work with PIC's but I really think that there most be an easier way for you than to use a PIC for this job.

Are you sure that there is'nt a signal out from the car stereo for an electrical antenna or for the amplifier, this is quite normal when you have a lineout signal from the car stereo.

Sorry this is getting OT !

Sharky

Ps. Thanks Melanie your circuit is really something I can use, normally I use a two-coulor LED to check if a fuse it blown, but it will be very cool to let a PIC do something to indicate that a fuse is blown