I still believe there must be a grounding issue somewhere. Corrosion at this terminal block will give strange symptoms also.

If I recall, since I don't have any information at hand, the neutral safety switch wires are the smaller ones at that terminal block. You should be able to trace it by eye and a little reasoning. The connections are to the battery, alternator, starter and neutral safety switch.

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Sam

84 300SD 350K+ miles ( Blue Belle )