Just bought this '91 560 SEL with the am-fm-cassette, I think it's model 1480. Anyways everything works except the right side speakers. I have adjusted the balance as per the manual, but still nothing. I can't believe all 3 speakers are bad. Any suggestions. Thanks, Bryce

 

some radios come with a few bundle for the speaker wires Some are configured as, a plug for rear, front, subs. Others are configured right speakers and left side speakers. One pssibility is that you have the plug in for right speakers/left speakers and the ride side speaker plug wires is hot. It might just be unplugged, frayed or broken usuall near the connector.

 

Bryce: I am 6 months behind you. I just bought a 91 300SEL. Right side speakers are out. I pulled the radio and looked at the back, nothing loose. I pulled the console out and examimed the balance wheel. It appears fine. I know how to work the balance on the radio. The left side (driver's side) is fine. If I fade to the right side I have no sound. Its not the balance. What was wrong with yours?