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Message: <blockquote data-quote="hispls" data-source="post: 8833440" data-attributes="member: 614752">This is because the issue comes from the car's ECU which is trying to be "smart" about how high to charge based on several variables to try to squeeze a tiny bit more fuel efficiency out of the car by not loading down when it isn't necessary.   I'd be willing to bet the exact formula of what it measures and when it decides to charge where is a mystery to everybody besides the engineers who figured out how to save 0.1MPG or whatever.Safe to say outside temperature, current load draw and possibly some sort of average engine RPM would come into play but possibly also something that considers battery health somehow.  That's the first things I'd be looking to monitor if I'm trying to figure out a charging system intended to fluctuate.</blockquote>