Here's more info on the OVP http://www.peachparts.com/shopforum/diesel-discussion/255537-ovp-relay-when-does-trip.html

I'd do more test to be sure it's a bad OVP, and not something else that is causing the OVP fuse to blow before buying one. I don't think they're cheap.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked