overcharging

I have read thru several of the overcharging threads and just wanted to put my scenario out here to see if maybe i missed something.


1969 Dart GT 1979 360, powermaster single field alt, mopar performance vr, battery relocated to trunk, Electronic gauges with ampmeter bypass.

Car ran fine for over 2 years and suddenly, battery goes dead, vr pukes out silicone, gauge shows alt at 18+ volts.

replaced all of the above, car will sometimes turn over, start, die, turns over and not restart. replaced Ballast resistor twice as well. other times it starts and runs but still shows 18+ at higher rpm.

Alt grounded to intake with star washers, 8 gauge block to frame ground, 4 gauge ground in trunk to frame.

What am i missing??

Bruce