Was the battery voltage measured with the engine running? If the engine was off, 12.8 volts is good. With the engine running, 12.8 volts means your charging system needs repair. Normal engine running voltage should be around 14 volts.
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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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