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It will sit for a couple of days and will not crank why is that Battery is Dead Could it be one of the fuses history of the car and what we have done the car is a 2000 chevy cavalier it has aftermarket cd player that stopped working thats the only aftermarket device in there. we have replaced the battery and connectors and starter and alternator and yet when it sits a day or two then the car is dead and have to jump it off after the initial jump off then drives fine. but we cannot figure out what is draining the battery dead we even thought it was a bad new battery and replaced the new for a newer one yet still does it
Hi @cowboy1784 , Check that the battery is OK. With the engine off, use a voltmeter and measure the voltage across the battery terminals. On a reasonable battery it should measure 11.5-12V DC. If <11.5V DC maybe check if the alternator is charging the battery. If you can start the engine (jump start with another battery?) use a voltmeter and check the voltage across the battery terminals with the engine running. It should measure 13.8V -14.4V DC. If not there may be a problem with the alternator or the voltage regulator. Be safety aware when measuring the battery voltage with the engine running. Ensure that the handbrake (aka parking brake, emergency brake) is firmly applied and that the transmission is in neutral (MT) or park (AT). Also watch that loose clothing, etc doesn’t get caught in the moving parts of the engine e.g. fan belt.
