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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,326
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Do you mean it is not starting, or not cranking? I think you mean not cranking.
The ground strap is not causing your no-crank. You proved that by starting it with the booster pack (I assume you connected it to the battery terminals). While you are under the car, it's a good idea to loosen it, wiggle it, and tighten it back down. Also remove, clean, and retighten the battery terminals.
Get someone to rev the engine to 2000. If the voltage does not come up to about 14V, you have a bad alternator or voltage regulator.
I also suspect the battery. How old is it? If fully charged on your C-tek, it should hold 12.6 volts for at least several weeks. If it doesn't hold the charge, it's most likely a bad battery, but also check for a parasitic current drain.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 11-12-2024 at 12:07 PM..
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