[gaswing]

imported post

Is there a CB on this bike? The mute is shared with the radio (terminal 19 blue wire) and the CB (terminal 9 blue wire). Check the switch on the CB as well.

 

[gaswing]

imported post

Just run the wire to ground from the radio. If the mute light stays on then your problem is internal in the radio.

 

[gaswing]

imported post

Well done Steve. This has obviously been a real head scratcher for you.