Originally Posted by
robertf03
It still goes through the amplifier and the trebel bass knob.
I'll post a picture once the circuit is done, the main part is a nte4066 chip that you can get at Frys and probably radio shack. Its basically an electronic relay that lets you select analog sources.
There was a blue wire in the radio that went to the volume knob. The volume knob is just a potentiometer so using a voltmeter I identified which one of the 3 legs was the low end of the carbon track, cut it, and the potentiometer side of the wire became the input line while the other half became the AM output line.