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Registered
Join Date: Mar 2002
Location: Dunstable, MA
Posts: 657
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911 main grounds?
After 25 years, I would like to remove and clean all the grounds on the car.
I am beginning to suspect that some of the electrical issues may be simply fixed by cleaning the grounds. So, can I get suggestions on where the grounds are, so. I don't miss any? Rich |
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11-07-2011, 05:38 PM
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Battery ground strap and transmission ground strap are two main ones I know of.. there are small ones to the body also, think there is one by the CDI box on SC's. A wiring diagram should show all of them, no?
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Gary R. |
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11-07-2011, 05:54 PM
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Capitalist and Patriot
Join Date: Sep 2006
Location: Freedomville
Posts: 1,923
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^ plus -> You want to look at the Bentley repair manual as it shows a very good diagram of the "ground zones" and locations of the grounds.
For instance on my SC there is a ground zone (cluster of ground wires) located near the front hood hinge on the drivers side inside front trunk near the gauge area. There are several of these ground clusters located in our cars, and these clusters are so important as they feed and complete so many key systems in the 911... Good Luck!
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Former Test driver & Production Manager Singer Vehicle Design 2009 Cayenne GTS, '81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold)  , '68 912 Targa (sold)  , '69 911E (sold) "Dream it, Believe it, Decide it, DO it " |
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11-07-2011, 06:01 PM
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Registered
Join Date: Mar 2002
Location: Dunstable, MA
Posts: 657
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Looking for all the grounds on an 84 Carrera
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11-07-2011, 06:17 PM
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Recreational User
Join Date: Mar 2004
Location: A Mile High
Posts: 4,159
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There are over a dozen ground points on an 84. There's a page in the wiring diagrams that shows the locations of all of them. I think the wiring diagrams are accessible online right here on Pelican.
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11-07-2011, 07:30 PM
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Registered
Join Date: Mar 2002
Location: Dunstable, MA
Posts: 657
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I looked at those and they seem to be for the 70's cars, up through the SC...but I did not see anything for the Carerra...and motronic.
For that system, I know of the main ground on the intake manifold, I guess I will just start tracing wires... Figured someone here would know of them all...and just give me a list. I know all the 914 ones by heart...btdt many times. Rich |
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11-08-2011, 10:40 AM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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Quote:
Here you go. Hope this helps. Gerry 
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1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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11-08-2011, 12:25 PM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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Rich,
There's a huge cluster of grounds attached to intake port #1 of your motor....an excellent place to start.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations
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11-08-2011, 12:38 PM
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Blackbird
2005 Porsche 997S 3.8L
