The engine wiring harness is notorious to fail on the 320 engine. There was not enough heat shield used and this problem is common. You will likely need a new harness. You can buy them for about half as much on e-bay as you can from Mercedes but you must know the exact part number from your existing harness. I would highly recommend buying a new harness over a used one but this is your call. They unplug completely as the harness wraps around the motor.
SOURCE: What is the radio code for a 1995 S320 Mercedes
Call your local Mercedes-Benz dealer and give them the radio serial number located on the back of the radio. They will give you the radio code for your radio. Hope that helps.
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