System Charging Too High

It sounds like you have high resistance some where in your charging circuit. Most likely place is in the bulkhead connector.Dosnt heart to clean all the connections in it. Or it could be a bad ground some where.
Make sure your alternator is not rated to high in amps, for your system. If your system is still factory, I wouldn't go over a 60 amp alternator, and that might be pushing it, if stock.
Make sure you voltage reg is grounded properly. I scratch off the surface underneath the mounting bolts, and use star washers, between it and the mounting surface.

Sorry I can't help you more.

barracudadave67