Possibly a bad diode in the OVP, yes, otherwise a short or some other problem in one of the loads (EDS, etc.) drawing 10+ Amps causing the fuse to blow. Quickest (not necessarily least expensive) diagnostic is to plug in a known good OVP. You can also remove the OVP and connect it directly to a 12V source; if it still blows fuses it is defective.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970