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'78 911 Coupe
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Ground Straps
Where do these ground straps go? I have the strap to the alternator on, attached the strap to the transmission, rear deck and CDI. I just can't find in my notes where these two straps came from??? Putting the car back together after two years. Any help will be much appreciated!
1978 911 sc coupe  Last edited by Brian Fuller; 05-07-2016 at 11:05 PM.. |
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05-07-2016, 05:23 PM
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ROW '78 911 Targa
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Are they the engine lid straps?
Edit: oops saw rear deck.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. Last edited by timmy2; 05-07-2016 at 05:35 PM.. |
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05-07-2016, 05:33 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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What MY/size engine, 1965 or 2011?
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05-07-2016, 09:10 PM
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'78 911 Coupe
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Edit added: 1978 911 SC Coupe
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05-07-2016, 11:07 PM
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Registered User
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Your best bet is to go through the electrical diagrams and check them all. I would call this standard procedure after 2 years of rebuild.
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05-08-2016, 12:12 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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Quote:
Search>Advanced Search>'ground straps'>search titles only>911 technical forum.. Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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05-08-2016, 05:54 AM
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'78 911 Coupe
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I did look through the electrical schematics. It shows ground but not specifically where on the car or if it is a strap.
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05-08-2016, 06:02 AM
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'78 911 Coupe
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I have located and connected ground straps on G1(deck lid), G3, G4, G8. Notice this diagram does not even list the alternator.
I don't believe there is a ground strap at G2, G5, G6, G7, and G9. Just ground wires. Still have these two unaccounted for straps! Ahhhh! This is turning into a good mystery novel.  |
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05-08-2016, 09:43 AM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Hmm... Maybe added by a PO? Or around headlight bucket area?
We have a partially assembled 78 at work so I'll take a quick look tomorrow.
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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05-08-2016, 10:20 AM
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Registered
Join Date: May 2006
Posts: 287
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They look like the noise suppression straps for cars equipped with stereo. Since the factory supplied those in pairs it seems like a possibility.
Usually covered in a black plastic sleeve. They connect to the each side of the hinge mounting brackets on the firewall, then they wind through the hinge and connect to one of the mounting bolts to the decklid.
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Jeff Jensen 1973 911 |
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05-08-2016, 10:43 AM
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'78 911 Coupe
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Jeff!!
You nailed it! I looked at all my pics from when I tore the car down and noticed the red over spray. I did a little research and indeed many of the 78's had two straps to the deck. Both of these straps have red over spray. So, now I have a new problem! I thought the smaller (narrow) strap in the picture below was my deck strap. So, now the problem is, where does this strap go?  
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05-08-2016, 12:08 PM
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Registered
Join Date: Feb 2009
Location: Park Hills, KY
Posts: 2,459
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hmm... wondered why my 78 had these on the deck lid.
so if I do not install a radio do I need them? 
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Bob Cox 78 930 clone project car. 87 924S resurrect at some point. 84 928S, Ruby Red linen/brown interior - sold  86 944 turbo my new DE/track car - sold
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05-09-2016, 05:01 AM
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'78 911 Coupe
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Bob! I'm asking myself the same question. My car had a tail on it and it looked like there may have been a rear wiper option. In that case, it may have needed the extra ground. I also see some threads that indicate the "abundance" of ground straps is for the issue of radio interference.
But my big issue now is, I have an extra ground strap in my hand that I don't know where it goes! |
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05-09-2016, 05:28 AM
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Registered
Join Date: May 2006
Posts: 287
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I think the radio ground straps were overkill. More to satisfy some DIN/TUV requirements than to satisfy any functional needs. The CDI box does put off some EMI though, so you just have to try it out and see what happens. And if you don't have a radio you definitely don't need them.
Sorry I can't help on the extra ground strap!
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Jeff Jensen 1973 911 Last edited by mobius911; 05-09-2016 at 09:08 AM.. |
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05-09-2016, 09:05 AM
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'78 911 Coupe
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I think I'm going to start a new thread since there is a lot to look through to get to my new issue.
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05-09-2016, 09:10 AM
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Registered Minimalist
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Thanks didn't know what the point of these was.
Some photos for your reference:   
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Duane / IG: @duanewik / Youtube Channel: Wik's Garage Check out my 75 and 77 911S build threads |
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05-09-2016, 09:15 AM
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Counterclockwise?
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How the hell can these things help the radio? lol
I just removed my rear wiper and removed these thinking they were either for ground to the lid or to remove static from the wiper. Now I don't know!
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Rod 1986 Carrera 2001 996TT A bunch of stuff with spark plugs |
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05-09-2016, 10:11 AM
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Registered
Join Date: Dec 2008
Location: San Antonio, Texas
Posts: 3,591
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A ground for the License plate lights?
Do you have one of those straps between your alternator and the engine block? Behind the alternator.
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1973 911S (since new) RS MFI specs 1991 C2 Turbo |
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05-09-2016, 12:30 PM
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Mighty Meatlocker Turbo
Join Date: Apr 2016
Location: North TexASS
Posts: 18,538
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Quote:
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05-09-2016, 03:07 PM
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Registered
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Quote:
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1986 Bosch Icon Wipers coupe. |
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05-09-2016, 04:38 PM
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Heinz
1975 Porsche 911s
