[Art Burtt]

Sounds like you have a dead short somewhere,if you ate 3 batteries, they are not getting charged. The new alternators
will not charge a dead battery and will fry themselves if asked to.
Most alternators come with instructons to make sure battery is fully charged when you hook them up, or alternator will fail and
warentee is void. Trace all wires and make sure all are hooked up properly.