a cd never ends, they just start over. lol for the tape deck yes it will run out of tape. ive got a xm tape deck line is, so i let that roll, as it will go forever with out stopping to flip sides.

the aux port in the post. just jumps the signal so the radio never knows. as long as the tape or cd is in and on.

in that post a guy did tap the radio wires, 4 and 6 or some crap, and he said it worked. page 24 iirc.