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Join Date: Mar 2013
Location: Marietta GA
Posts: 3
82-911sc electrical problem

Need help/direction.

PROBLEM… quick flash on turn/hazard (all bulbs are good)

…occasionally while driving dash brake light comes on and tach goes crazy for 5-10 seconds

ELECTRICAL SHORT … but where do I start and how do I chase it?

I've owned this Porsche for 30 years!!
Thx.

Old 03-28-2013, 07:28 AM
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pete3799's Avatar
 
Join Date: Nov 2008
Location: Vermont
Posts: 7,431
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Turn signal flasher relay is the likely cause of your rapid flash (was on mine anyway).
Get a volt meter and monitor it while you drive. I'm guessing a voltage spike is causing your Brake light/ tach problem. Time for an alt. rebuild i'd say.
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Pete
79 911SC RoW
"Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey
Old 03-28-2013, 08:04 AM
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schumicat's Avatar
 
Join Date: Apr 2010
Location: New Orleans, LA
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agree with Pete...sounds like voltage regulator. they cause random elec. gremlins when failing.
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1982 911SC, Mocal oil cooler, Bilsteins, Carrera tensioners, backdated heat, factory short shift, Seine gate shift, turbo tie rods, pop off.
2005 Mercedes-Benz C230 kompressor sport 6-speed (daily driver)
Old 03-28-2013, 08:33 AM
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kodioneill's Avatar
 
Join Date: Feb 2007
Location: upstate new york
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Advanced auto sells a tool that plugs into your cigarette lighter that has a nice readout for checking battery voltage and charging conditions not very expensive either $15-20.

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1974 sahara beige 911 targa
1982 chiffon 911sc
1985 prussian blue metallic carrera
Old 03-28-2013, 08:52 AM
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