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Tea Tray shows the likely problem, dirty 14 pin connector. A drop below 13 volts while running shows that the alternator is no longer charging. Pin 11 on the 14 pin connector takes the instrument alternator light current and uses that to excite the alternator. If the connection is bad, you will have intermittent charging, as you see. Clean the connections in the 14 pin connector and see if this helps. After 10 years, you need a new battery. You guys who live in warm climates seem to get more life from a battery than I do.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods.
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