I had something similar happen, twice! Came out in the morning and the car wouldn't start as if the battery was discharged. Voltmeter reads like 9-10V. Gave the car a boost and let it run for five minutes. Shut down and then restarts like nothing had happened. Voltmeter reading while running was above 13V and gradually got back to normal of ~14.5V after a few hours of driving. Happened again after a few months for no apparent reason like the first time. Gave it a boost and all was fine except the low voltage reading. Never did find out what wrong. Car had less than 6000 miles on it when it happened the second time.
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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