Finally replaced both AGM 8D's with regular lead acid 4D's. Charger was fine, my mechanic went to check hoses, belts and clamps, by chance touched port engine alternator and it was very hot... i.e shorted. Probable cause to damage or ruin the AGM's so that might had been the culprit. Rebuilt the alternator for $125.
New batteries, oil, coolant, thermostats and belts.... Ready to put more hours on the old 3208's