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What is this large ground wire near the battery for?

 
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mattaebersold  



Joined: 12 Dec 2018
Posts: 31
Location: Washington, United States

PostPosted: Mon Feb 08, 2021 8:10 am    Post subject: What is this large ground wire near the battery for? Reply with quote

Rebuilding a 931, and I see this wire near the battery... looks like a main ground, but the battery terminals are already there... this is just hanging out.

- does anyone know what this is for?
- how would I ground this? Just add a large end piece and bolt it to the body?



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931-1979  



Joined: 13 May 2016
Posts: 4
Location: Austria

PostPosted: Mon Feb 08, 2021 4:16 pm    Post subject: Reply with quote

I think it´s the + to the startermotor
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Paul  



Joined: 02 Nov 2002
Posts: 9467
Location: Southeast Wisconsin

PostPosted: Tue Feb 09, 2021 2:04 am    Post subject: Reply with quote

Oxygen sensor?
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mattaebersold  



Joined: 12 Dec 2018
Posts: 31
Location: Washington, United States

PostPosted: Tue Feb 09, 2021 6:06 am    Post subject: Reply with quote

931-1979 wrote:
I think it´s the + to the startermotor


The starter did work before I tore down the engine, so I don't think it's that
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mattaebersold  



Joined: 12 Dec 2018
Posts: 31
Location: Washington, United States

PostPosted: Tue Feb 09, 2021 6:07 am    Post subject: Reply with quote

Paul wrote:
Oxygen sensor?


Interesting, so I should just put a connector on it and ground it to the body? Or somehow splice it into the negative battery terminal?
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chuck21401  



Joined: 20 Feb 2005
Posts: 347
Location: Annapolis, MD

PostPosted: Wed Apr 07, 2021 8:55 am    Post subject: Reply with quote

It might be a stretch but I've read that some have run an additional ground wire from the block to body ground near the negative battery terminal to help with mysterious grounding issues. This was written up in the most recent issue of Excellence magazine.

So another clue might be....where does the other end of that wire go?
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