Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 10-19-2000, 06:23 PM
Registered User
Join Date: May 2000
Location: Scotts Valley, CA.
Posts: 145
Help me techno-wizards!!
What is the function of the overvoltage relay (I've seen it mentioned many times on the board) and what can be effected if the overvoltage relay goes bad?

I'll be I'm not the only one who is in the dark on this...

Jay Yambrovich
1989 300 E
1992 190-E 2.3
Reply With Quote
Old 10-19-2000, 08:56 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Basicly it's a protection device for the computers. It's there to keep excessive voltage spikes from damaging them.
Reply With Quote
Old 10-19-2000, 09:22 PM
Registered User
Join Date: Jun 2000
Location: Tucson, Arizona, USA
Posts: 180
You should interface with fiver64; check out his thread. Also, I found a search on, "protection relay ABS" produced some good background info. Cheers, Andrew Seidel.

89 190E 2.6
83 300TD Turbo
75 240D
Reply With Quote
Old 10-20-2000, 07:08 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The OVP (overvoltage protection) relay uses a Zener diode to act as a voltage regulator, spike suppressor. The diode allows current above a certain voltage to pass through the fuse to ground. Small spikes are just shunted larger ones blow the fuse.

The device is similar to a UPS (uninterruptable power source/whatever) for the car computors that are hooked to it.

The reason it causes so much problems (amongst those not familiar) is that the main system affected (KE-Jet) works rather well without electronic control. It looses all its enrichment schemes; most noticably cold start/warm-up enrichment.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
1987 Mercedes 190e 2.3 and Overvoltage Protection Relay Eidetic57 Tech Help 3 12-13-2004 12:07 PM
Bizzarro Overvoltage relay problem classic69 Tech Help 6 10-11-2003 08:38 PM
Won't start cold-blows fuse on new overvoltage relay rradeski Tech Help 0 11-14-2001 08:51 PM
Overvoltage Protection Relay Failure Modes Telerding Tech Help 1 10-19-2001 12:17 AM
Another question about weird idle & overvoltage relay Karl226 Tech Help 4 02-20-2001 08:53 AM

All times are GMT -4. The time now is 08:27 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page