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#1
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Where is OVP Relay 1987 300 TD
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 |
#2
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Behind the battery, and the plastic splash-shield, there is a red-top/fused relay mounted to the side of the ECU bracket.
__________________
![]() Gone to the dark side - Jeff |
#3
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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 |
#4
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I didn't see it back there.
Is it under a black plastic cover? |
#5
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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 |
#6
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Found it hiding in there.
Thanks again. |
#7
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OVP voltage
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?
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#8
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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 |
#9
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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!
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