1992 mercedes 400se

I turned the last one away. It's a nightmare!

Quite simply, the labor I needed to charge outweighed the price of the radio. The customer didn't want to spend that much, and I understood.

hi,

assuming the system operates fine already (bose amp hasn't taken a c...), you really don't need to do much.

the stock radio location has battery, accessory, ground, illumination, power antenna or amplifier turn-on (one or the other) for the new headunit.  you'll need to add an extension cable for the antenna, additional remote lead, and a pair of cables for your audio signal (rca's).  the stock system uses a fader in the dash/console. 

connect your extension cable to the cable plugged into the tuner box in the trunk.  the female tab terminal (next to the power connector) on the tuner is a remote lead.  all that's needed now is audio signal (on tuner chassis also). it should be either two 2-pin connectors or a 3-pin one.  the 2-pin ones are marked for polarity, the center terminal of the three pin is the signal common. make your connections here.

hope this helps

mark

hi again,

forgot to add...you can try the speaker outputs or the line outs for input for the amp.  the line outs will work best if the headunit has a higher voltage preout (2V +).  if not enough output, then try the speaker outputs.  you may need to add an adjustable line output converter if there is too much output however.

mark