my batery goes dead wen i turn car off on 1996 Dodge Stratus

is it my altanator or batery

Asked by for the 1996 Dodge Stratus
Di dyou check to make sure nothing is on like the glove box light or trunk light. Without a multimeter you're guessing but is the battery light on when the car is running? IOf not then it may be a battery. This has to be a replacement battery in the car now anyway.
1 more answer
test it with a voltmeter, with the engine running it should have 14+ volts otherwise the alternator is bad. and your battery 12.6 atleast with the car off once it is fully charged