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Old 12-22-2003, 12:11 PM
Ken300D Ken300D is offline
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
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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1987 300D at 370K miles
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