Originally Posted by
indcontrols
Is the alternator a 1-wire type ?? Many of the 1-wire style alternators will not charge at idle, the internal regulator does not receive the proper "excitation" until it is spinning faster. this is especially true when we hotrodders and racers add underdrive pulley systems.
I agree.Underdrive pulley could be cause. If it has normal charge at high RPM you will need to try change the pulley