the new radio had connections for front and rear speakers. the original radio only had right and left wires to the radio.

since i seemed to only have one 'set', i just connected the new radio's 'front' wires to the old radio's left and right.

what did i do wrong?

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Ben
1987 190d 2.5Turbo

Have you looked at the wiring diagram for your car?

On my 91 124 it has a fader to balance front and rear in the console. That had to be bypassed and wires run to the rear speakers.

Again, review the wiring diagram for your car.

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This car had a history, now it has a future.

Learn more about my Benz here.

I ran into a similar problem installing a sony in our old Chevy truck. Hooked everything up and... Nothing. So, I read the book and called the "help" line and etc. Then I found out that the radio had to be "configured" in a menu for 2 channel stereo or 4 channel stereo on the display. I went thru all that crap and it has worked ever since. I also noticed that the radio didn't have fuses anywhere in the output section. The response I got from the "tech support" guy was that the radios no longer have fuses- but if they see too low a resistance- they "shut down" the output amp like a fast relay to prevent a bunch of warranty repairs from peple crossing wires when installing them. Good luck.