Last year I inherited a 1987 300SDL from my grandfather. He had replaced the stock headunit with a Premier DEH-P250. The right front and left speakers work, however there is lots of noise and I don't get anything from either the front/back left speakers. Today, I went and replaced the Premier with a Pioneer X6600BT which went well, but still nothing from the left speakers.

I was under the assumption that there were 2x25 amps located behind the rear seat, so I removed it to find nothing. I then looked for an amp in the passenger side trunk but couldn't find anything without ripping out the carpeting. I tested the left side speakers with a multimeter, and the speakers themselves are fine. When I tested the wiring to the left speakers, nothing.

I've scoured this forum, among others, and haven't found a reliable answer so I could please use some help.

1) Where, if any, are the external power amps located?

2) Considering that I'm not getting any signal to my left side, what is the most likely culprit? A bad connection at the fader?

3) Is there any problem with bypassing the fader, external amps, and just running everything from my new headunit?

4) What's the easiest way to rewire it so everything runs off the headunit? I should be able to find the rear connections at the fader, cut them, and then run them directly to the headunit, right?

Thanks for your help! Also, if anybody has a gray passenger side rear speaker cover, let me know!


http://www.mbca.org/forum/how-do-you-rewire-fader-switch-aftermarket-radio