Hi
Can anyone help me locate the over voltage protection relay on a W 124 1987 300 TD?
I looked behind the fuse panel & on the passenger side where the Klima relay is.
Thanks for your help in advance.
B

Behind the battery, and the plastic splash-shield, there is a red-top/fused relay mounted to the side of the ECU bracket.

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Gone to the dark side

- Jeff

beat me to it, its back there behind the battery.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

I didn't see it back there.
Is it under a black plastic cover?

There is a black shield behind the battery that runs from the battery tray to the cowl. Pull that out. The OVP is red and back with the computers and klima.

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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500

Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i

Found it hiding in there.
Thanks again.

Hello, anyone know what the correct voltage to the OVP for an 87' 300D is? I'm getting around 13.5V, to me this seems okay but it everytime I plug in the OVP the fuse blows immediately. Faulty OVP?

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
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-- Janis Joplin, October 1, 1970

Thanks Jeremy, your idea of testing the OVP was smart. It was defective and blew under 12V. I believe the coil lost continuity somehow. Thanks!