justreplaced the alt in my 6.2 burb and now it doesnt seem to wanna charge well. if running at idle with glow plugs off it will charge up to normal on gauge but if put wipers lights and blower on it will go way down almost to red. tried swaping ion batteries that were better and still same deal. what gives? the only thing i noticed that was odd was a bolt on the back of the alt that has no purpose. is that a new design where they have a ground strap going there as the normal bracketry isnt a good ground or something?