I cleaned the connections at the junction box.

A while back, I thought I found the problem. The larger of the two connections (positive) on the starter was loose. Tightened it up. No change.

More recently, found out that the transmission wiring that goes down and around the rear engine/transmission mount was exposed and shorting.

Thinking once again, that I found the problem, I fixed all the wiring up and still continue to have the same issue.

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'85 300D 190K miles
running on B100 Biodiesel since 156K, SCRATCH THAT! I can only find Biodiesel at 1 location in Houston! (not very convenient)