Quote:
Originally Posted by Showguns
I noticed the other day that when driving, the battery gauge reads 13.5 or 14. This is good. Then another day it read 10.5 or 11 the whole 15 mile drive and then wouldn't start the next try. Looks like it isn't charging (some of the time). The alternator and battery were said to tested fine.
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That is normal, GM uses a smart charging system to charge the battery. This is partly done to reduce load on the engine and to increase fuel economy. The other is to vary charging to the battery so it doesnt develop a normal charge pattern.
They have used this system since at least around 2010.
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