Sound like alternator has bad diode allowing battery discharge
You may have something in the vehicle that is draining the battery even when the ignition if off and the key is out. Has a new accessory been installed and it is connected to the hot side of the electrical system that does not get shut off with the car?
When you got the new battery, was it installed in the car,the car not driven and the battery was dead after two days of sitting? Or was the car driven and then sat for two days and died. If it was driven, then your battery charging system may not be keeping up with the electrical demand of the operating vehicle. After it was parked it may not have had enough juice to restart the car. Jump start the car and test the DC voltage at the battery terminals. if it is 12 volts or less, have the charging system checked. If it is 13 plus volts then the battery is being recharged.
SOURCE: good alternator & battery, but battery goes dead just sitting
The regulator could be sticking in the alternator. Unplug the alternator and see if the battery goes dead. I replaced an alternator once and the new regulator was bad.
SOURCE: battery was dead charged it up and tryed to start
More then likely you have a bad battery, if you feel battery is charge up, turn your head light's on , try to start car, if your head light go dim your battery needs to be replace it has bad cell's.Hope this was helpful.
SOURCE: 2002 pontiac montana wont start battery tested
no Alternator wont stop it from starting or rolling over as long as good battery...try connections on starter..that would be what i looked for first
SOURCE: new battery alternator checked
probally have a draw someplace. If you have a volt meter, you should know how to use it then, check to see what the amps are when the key is off. Unhook postive or negivte batter cable, put one end to the battery and the other to the cable and you'll get your amps. If it's under, 1 I belive you're good. If more, let us know.
SOURCE: car wont start i get power but wont turn over
About the only thing left would be the battery cables (assuming the starter solenoid was also tested). A corroded connection at the battery terminals or oiled-up connection at the starter is all it takes.
Another thought ... have you checked for voltage on the solenoid terminals to make sure the ignition switch is properly installed?
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