Lemme add one more idea... up on the right side fender, near the battery tray is a black housing with three screw terminals and wires inside it. Should be two screws with fairly heavy wire and one with a smaller gauge wire. With the neg. terminal disconnected from battery, take the screws out one at a time and take a stiff wire brush to the rign lug connectors and to the screw terminals and the screws. Put it all back together and start the car. now check the voltage at the battery. I have seen oxide buildup on those connections keep a battery from charging.