It'* a brand new battery, and a new alternator, so how would I be able to tell if the alternator'* bad? Just checked the connections on the battery, they're clean and tight.
I'm beginning to suspect the new alt is bad, but I still think the belt is slipping as well. It only hops up to 16 for a few seconds, then drops back down to just under 14, and only when I have headlights and defrost on.
I'm going to do the tensioner this weekend just to eliminate it from the list, since I know it'* about shot. Maybe it will solve all of these problems, if the belt is slipping.