Jimmy is right. Why OVP fails as much as we seem to read about I do not understand. There's hardly anything in there -- a relay, a Zener diode, and a fuse. If anyone would like to send me their dead OVPs, I will find out what failed. It would be an interesting project and if I can make a repair, the OVP goes back to the donor at no charge. It would be worth it to develop an understanding of the failure modes.

Jeremy

__________________

"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