Classic diode module problem.
It's in the rear of the fuse box where all the relays are located. I think you have to take out some screws and remove the cover to the back half of the fuse box.
The diode module is a bit smaller than the other modules, and only has two pins.
Its either electrically bad (blown) or physically cracked.
The module can be carefully disassembled and a new diode put in its place. Just about any generic diode will work.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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