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Registered
Join Date: Feb 2013
Location: Texas Hill Country
Posts: 121
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Low cost electrical improvements - neg battery cable, ground strap, clean door switch
I thought I would pass on some electrical tips that made a difference on my 85. I needed a new battery as it was testing about half its rated cranking amps. Because the previous owner had a parasitic draw he never fixed, he put in a gigantic 1100 CCA battery. At half capacity it still started the car - and I drove it like this for 2 years.
I got rid of that boat anchor and got a AGM sealed H6 battery per the many great recommendations on this board. But to take it a step further, I ordered a new negative battery cable and a new transmission to body ground strap from our host. The new ground straps are inexpensive and fairly easy to install. The car seems to idle better and the gauges seem a bit smoother. I think 30 year old ground straps cannot be as good as new ones. I then tested the parasitic draw and traced it to the door switches. 10 minutes of pulling them out, sanding them shiny again and adding a dab of contact grease and my parasitic loss is nearly gone completely. If you have a regular battery drain and/or any strange electrical issues, I'd try these easy fixes in your troubleshooting.
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1985 Coupe, Rennshift, SW chip, 7/9s, LSD |
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08-02-2015, 03:44 PM
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Member 911 Anonymous
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Good Job!
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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08-02-2015, 03:56 PM
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Registered
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Good work and good advice!!!
thanks.
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RGruppe #79 '73 Carrera RS spec 2.7 MFI 00 Saab 95 Aero wagon stick 01 Saab 95 Aero wagon auto 03 Boxster 90 Chevy PU Prerunner....1990 |
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08-02-2015, 04:12 PM
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Registered User
Join Date: Aug 2011
Posts: 63
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Nice job Jeff!
S |
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08-02-2015, 05:16 PM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Long ago I heard from an old timer, "clean, bright and tight." Can keep a myriad of problems from developing.
Nice work and a question. Did the new cable and strap look like the old ones in every way? Like soldered instead of crimped ends?
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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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08-02-2015, 05:21 PM
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Registered
Join Date: Feb 2013
Location: Texas Hill Country
Posts: 121
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the new negative battery cable from Pelican looked much better - it was fully insulated and soldered vs. the old corroded, bare wire crusty one. The new transmission copper ground strap was nice and shiny with soldered filled ends. I had to grind one end a little to round it so it would fit flat on the stud but no big deal.
 
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1985 Coupe, Rennshift, SW chip, 7/9s, LSD |
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08-02-2015, 05:56 PM
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Registered
Join Date: Jun 2013
Location: Park Ridge, IL
Posts: 1,240
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I just replaced my battery negative strap with the same cable you show above. It looks much better than the old one, and I think my starter cranks faster now. Might be my imagination, but I don't think so.
Dave
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Dave McKenzie 1984 Carrera 3.2 1984 928S Automatic 2001 996TT |
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08-02-2015, 06:16 PM
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Marble Grey
RS Homage
