Stovebolters

With key off, no draw at the battery, thus assume there is no parasitic discharge.

At driving rpm/fast idle, charging rate is 6.8, truck continues to run if battery cable is pulled

At idle, charging rate drops to 6.3, and truck will die if battery cable pulled.

Fan belt is adjusted to 1/2

Generator just weak? Or battery needs charging/driving time?

Thanks
Joe