Well if your battery is good, and your alternator is good...then maybe you have a short sucking the battery down? Do you have a voltmeter? If you shut the engine off and put a voltmeter across the + & - terminals and you notice the voltage dropping fast (and there are no lights on in the car), then you could have a short somewhere draining the battery. Determine that first....if you have a short or not.
Check the alternater belt and its tension
You have something draining it. Find the fuse boxes, and pull a batch of fuses overnight, and see if it solves it. If not, next night pull another batch until you find it.
Most likely will be courtesy lights, radio, aftermarket extras, or towing sockets.
Here's a test you can try. With the car running in idle, disconnect the negative side of the battery. Does the car still run? If it does, then the alternator is good. What's the voltage reading? If the car should die, then there is a problem with the alternator or the voltage regulator or some wiring associated with the charging circuit. Good luck.
SOURCE: Battery will not hold a charge.
I don't know how you figured out that your battery was good, but if it drops to 9 volts I highly suspect that it is bad. You need to have it load tested. This will tell if it is bad under load.
Also if it is bad it can cause the alternator not to work even if the alternator is brand new.
SOURCE: Battery replaced - won't hold a charge. Is the alternator the problem?
THE BATTERY IS ONLY FOR STAR THE CAR. WEND THE THE CAR IS RUNIG ALTENATOR IS CHARGING THE BATTERY FOR NEX TIME YOU NEED TO STAR THE CAR . CHECK CHARGE ON THE ALTENATOR . IF ALTENOTOR NO CHARGING REPLACE.
SOURCE: new battery and alternator. Battery still won't hold charge
Check all your fuses if you had a system failure it could have blown a fuse. I am not sure on your vehicle where the fuse is in the car or under the hood it could also have a relay. You can check your alternator by checking the voltage at the back of the alternator where the big wire bolts on. You should have 14+ volts at the alternator.
SOURCE: Battery is not holding a charge on my 2003 Nissan Altima.
You might have a parasitic drain on your battery. Meaning something isn't shutting off like it should be draining your battery. Your positive battery cable might be shorted to ground not allowing power to flow.
SOURCE: battery wont hold charge
HI. you may have a battery drain issue that is sapping your battery overnight.
Here is the procedure I use to isolate a battery drain. Remove negative battery cable from the battery. Using a 12-volt test light, hook one end to the negative battery post the other end to the negative battery cable you just disconnected. The test light will glow or "light" if there is a drain. If the "light or glow" is faint, that is probably normal draw for the clock or computer. If the "light or glow" is bright, then there is a large drain. That should be corrected. Now start removing and replacing the fuses one by one until the light goes out; that one will be the circuit with the drain. Remember to hold in the button in the door jam for the interior lights.
152 views
Usually answered in minutes!
×