Cuda overcharging? Please help...

Check the wiring between your alternator and your voltage regulator. Mine did the same thing and I found a wire that was grounding out on the firewall behind my coil.

Mine was intermittant, but once I found it and covered up the bare copper wire, it stopped. I've also upgraded to the two field alternator and had run my own wires to the voltage regulator so the stock wiring didn't get over heated with the higher output of the new alternator, but the premise is sound. There is a wire that is shorting out that is causing your charging system to over charge.