Use the Mercedes to take out my Sister to lunch on the beach. Beautiful day! Anyway, came back and needed to let the engine idle and the station started to play "Brother Louie". I like the song, so decide to see if I could figure out the rear speakers. The left had a tad bit of sound but nothing from the right. I had moved both panels trying to find the missing snow chain and figured I must have bumped something. So I wiggled the right's wires around and nothing. Then I remembered what I did on the old home stereo: turn up the volume to almost three quarters. Bam! Now I have functioning rear speakers!