Why wont your battery on your 2003 dodge ram 5.9L V8 hold a charge when it is off?
Possibly dead cell in battery which would mean the battery is defective and needs replacing. Also can be some light on the vehicle is on and pulling power from the battery. Can also be a relay is stuck closed. Check all lights such as under hood, trunk, glove box, dome, courtesy, and brake lights. Check p/w, p/l, p/s, fuel pump relays.
Dodge Durango 2000 8 cylinder battery not accepting charge will only run if connected to running vehicle alternator tested good any ideas?
Has the battery been tested, does the alternator on the Durango try to charge?... If the truck runs with the battery but the battery doesn't take or hold a charge, it has to be the battery being bad or extremely bad terminals so that the charge can't reach the battery. Age of the battery doesn't matter, a fairly new one can still go bad.
30 year old battery?? I have never heard of a battery lasting this long. This has to be a record of some sort. I would contact the battery manufacture as they may want this battery and give you a new one for it. Anyway if the battery will not hold a charge it has a dead cell and needs to be replaced.