The Battery will not hold a charge. Alternator tested good, battery was brand new, dead within a week.
Try to check the battery voltage with the engine running. Should be at least 13.6V from the alternator to charge the battery enough.
Check to see that the trunk light and glove compartment light actually turn OFF when the trunk and glove box doors are closed. Also, if one of the diodes on the alternator has failed, it may still test "good." With the car sitting, ignition off, fully-charged battery, check to see if the back of the alternator is HOT. If it is HOT, replace the alternator.
SOURCE: 1999 Plymouth voyager brand new battery.
Alternator must have about 14 volts running under load and 90 or 130 amps according to which alt. you have.
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