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#2
12-09-2003, 07:34 PM
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Actually, its the overvoltage protection relay, and it keeps voltage spikes or a runaway alternator from frying the electronics. Cuts the voltage to all sensitive circuits when the voltage gets too high.
It also tends to get "tired" and cut the current when it's not supposed to as well, probably the reason you need to replace it. Usually just cracked solder joints, but can also be burned contacts. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! 
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#4
12-10-2003, 11:00 AM
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Where are the W123 experts? I'm 90% certain your car doesn't have an OVP relay.
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Rick Miley 2014 Tesla Model S 2018 Tesla Model 3 2017 Nissan LEAF Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro Chain Elongation References
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#6
12-10-2003, 12:07 PM
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Oops. I read 82, not 92. Sorry about that. The OVP should be between the two firewalls on the passenger's side, and should have a fuse on the top of it. I've never seen a procedure for testing, most people just replace them.
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Rick Miley 2014 Tesla Model S 2018 Tesla Model 3 2017 Nissan LEAF Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro Chain Elongation References
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#8
12-10-2003, 04:00 PM
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Testing procedure is thump it with the handle of a screwdriver and see if it starts working again! When it fails the ABS light will always come on and the engine may run rough, stall when D is selected or become hard to start when hot.
But seriously, you can open them up and re-solder all the pcb joints - it worked for me and the car ran fine for another 2 years before I sold it.
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Mick J '08 Chrysler 300CRD (MB OM 642 engine) '95 E220 estate '89 230TE (R.I.P.)
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#9
12-10-2003, 04:22 PM
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what is an overload protection relay hmmmmmm
its a belt with a buzzer in the buckle.
If you eat too much it goes off BUZZZZZZZZZZZZZz 
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"If anyone knows other lessons I need to learn, please tell me. I'm tired of learning them the hard way". by JerryBro The Glow Plug Wait: This waiting period is a moment of silence to pay honor to Rudolph Diesel. The longer you own your diesel the more honor you will give him". by SD Blue My normal daily life; either SNAFUed- Situation Normal... All Fouled Up, or FUBARed- Fouled Up Beyond All Repair 62 UNIMOG Camper w/617 Turbo, 85 300SD daily driver- both powered by blended UCO fuels
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#11
12-11-2003, 08:09 AM
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New Overload protection relay from Parkplace Midcities 69.00
self install saved 108.00 a happy wife...PRICELESS power restored, I am assuming the relay does a alot mor than originally suspected. Thanks for everyones input!
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Wayne Jockers 1992 300D
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#12
11-12-2005, 07:54 PM
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Yes
Our friend the OVP keeps expensive electronics from turning into toast.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#13
11-12-2005, 08:30 PM
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Ovr
I just replaced mine awhile back...but before replaced my tach would fall down to nothing and it appeared that the turbocharger wasnt working. Darn lights on the cluster acted like a pinball machine. So I took the forums advice and replaced it with an OEM relay and sha...zam it worked...no more odd stuff has happened since... I cracked my plastic shield upon reinstallation also..oh well
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1993 300D 2.5L 240,000+ miles
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#14
11-12-2005, 09:05 PM
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Quote:
Quote:
It is sometimes known as a 'crowbar' circuit, from the idea that you protect the circuit by throwing a crowbar across the incoming line, causing a short circuit that guarantees that the fuse melts and protects the circuit. After all, OFF is safe...  That is a method of preventing electronics developed before electonics coud withstand any voltage that the alternator can reasonably produce. For many cars the OVP is no longer needed.
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#15
04-09-2008, 10:40 PM
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Is this my Overvoltage Protection Relay, I am working on my wifes 1993 190e 2.6? She is having cold start problems.
  I thought it was suppose to look like this with 2 fuses instead of one, this is why I am asking.  Thank you.
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1981 Isuzu 4x4 1.6l diesel 1982 chev luv 2.2 diesel 1983 240d's 2 1983 240d part outs 1994 ford F350 7.3l turbo diesel 4x4 crewcab 5spd Last edited by whunter; 12-29-2008 at 09:14 PM. Reason: attached pictures
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