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-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 01-06-2010, 01:29 PM
Registered User
Join Date: Nov 2009
Location: Austin, TX
Posts: 22
85 300D Battery Ground Strap

I was cleaning my connections today and I noticed that when I disconnected the negative ground strap that bolts onto the firewall, the strap shares the terminal with four red wires that connect onto a single post connector.

While the grounding strap was not sparking at the battery terminal, these four red wires were sparking on the grounding post as I loosened the nut (the key was not in the ignition).

Not sure if that would indicate a short ..... anyone know what those wires ground?

Reply With Quote
Old 01-06-2010, 07:36 PM
Registered User
Join Date: Nov 2009
Location: Austin, TX
Posts: 22

Lotsa views but no opinions. That's rare for Peach Parts!

Shall I snap a photo? I'm pretty sure I'm looking at stock wiring.

Reply With Quote
Old 01-06-2010, 08:12 PM
Jeremy5848's Avatar
Registered Biodiesel User
Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
My '85 300D-T (W123, OM617) also has those wires, whcih dive into a fat cable going who knows where. They may be "faded brown" rather than "red" in color; the Germans use brown for ground religiously (or brown with a color stripe if you have a Doctor of Divinity degree ).

In the ETM, I can't find anything except the battery grounded to that point (G100) so I don't know what the wires are for. If they spark when touched to ground, they are likely for circuits that use power even when the key is off, e.g., interior lights (with door open), etc.

At any rate, you are right, they are supposed to be there.


"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
Reply With Quote
Old 01-07-2010, 02:17 AM
Registered User
Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
Posts: 9,585
I looked at mine today. looks like one wire connected to the bolt, and drops down under the battery into a large wire harness to who knows where. as far as the color I didn`t determine one. but didn`t notice one being red.

I know the clock runs all the time, don`t think it is enough to make a large spark.

try removing one fuse at a time to determine which circuit it is.

there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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

All times are GMT -4. The time now is 12:57 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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