Battery will not stay charged
First of all, is alternator charging the battery. Battery voltage when engine is off, should be at least 12.6 or better at battery posts.less than 12.4 with engine off. Battery is going bad. When engine is running at battery should be at least 13.8 to 14.2 or more if alternator is charging. You can go to any auto parts store, and get the charging system checked for free Advanced auto, Auto-zone, ETC, Good-Day! if battery and alternator are good. Heres how to check for a current drain. Disconnect negative terminal from battery, Hook a test light to the negative cable. connect opposite end of test light to battery negative post . wait at least 5 minutes, with test light hooked up. if light is on. Then start pulling fuses in fuse box, when the light goes out. thats the problem circuit.
SOURCE: 2003 ford e 350 van Battery will not stay
Something is drawing battery down. the quickest thing is verify there are no dome lights, ect on when doors are closed. You will need to disconnect one side of the battery and insert a test light in line. with the light hooked up the light should be be lit up, now start disconnecting fuses until the light goes out, when it goes out, that tells you the draw is on that circuit and now you can narrow down the components on that fuse circuit. I ASSUME this happened before the alternator was replaced.
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