Car Battery Keeps Dying But Alternator Is Good

The bad alternator diode can cause the circuit to charge even when the engine is shut off and you end up in the morning with a car that won t start.

Car battery keeps dying but alternator is good. And got out for 5 minutes and get back in it still takes a second as if the battery didn t charge while i was driving. What causes a car battery to keep dying. So when your alternator tested good but the battery keeps dying then you ll need a charging system troubleshooting. Assuming your battery is good and your alternator is charging the battery properly the next suspect is a short somewhere that is leaking power when you re not using the car.

Sounds like you may have a short drain of some sort. With the car engine off and anything that might consume electricity turned off including the inside light. Now let s look at the troubleshooting process charging system failure symptoms. I was wondering if it was a bad starter or messed up cable.

Some of these problems are enough to kill a battery on their own while others are usually coupled with a battery that is already weak or on its last legs. This can be an interior light radio etc. Simply put if you can drive the car for a while more than a 10 minutes and the battery is completely charged when done then the alternator is working fine. Battery is getting a charge too.

Some of the guys that do the. Frequent starting and stopping draws a lot of current but does not allow the alternator to recharge the battery fully. In the modern charging system you ll find the alternator wiring battery and electronic control unit. You see the most onerous task of your battery is to provide the starting power to the ignition.

You all the time. Autozone says alternator is good but battery keeps dying. Unfortunately this problem can be caused by many reasons such as an old battery that needs to be replaced or something more serious such as a dead or faulty alternator. If your alternator has a bad diode your battery can drain.

Find the car s fuse box and remove the cover. Another reason why a battery keeps dying even with a good alternator is when the alternator is not given the time to recharge. Check for anything energized while the car is off.