If the vehicle is not even running or begins to die after as you say an hour that means you still have a charging problem. basically the only reason the battery is there is to start the vehicle. The alternator/charging system is what runs the electrical system in the vehicle. In the power distribution box (a fancy name for a fuse box) under the hood of the vehicle there is a fuse for your charging system. Below is a picture of the layout of the fuses in the panel under the hood of the vehicle in the engine compartment. I marked the fuse you need to check. It's a 15 amp fuse and will cause the same thing as if the alternator was bad. I hope this helps.
Something is not right. If your alternator is working when running (charge light IS off?), then just driving it for about 30 minutes, should charge your battery enough to allow it to start the car after that.
If your battery got real low, you should take it off and charge it with a battery charger. If it won't hold a charge, it probably needs replacing. Parts stores will check your battery's condition for free.
SOURCE: REPLACED THE ALTERNATOR BUT THE BATTERY WILL NOT CHARGE
check the regulator on the side engine panel
SOURCE: Battery and Alternator Good. Alternator not working. HELP!!!
djn, I believe you have some accessory that is on when the key is in the off position.
Check to make certain glove box light is not on when the glove box door is closed and the trunk light is not on.
If you have an aftermarket radio or any added accessories make sure they are not wired direct to battery voltage.
If all that checks out, disconnect the battery negative and connect a test light between the battery and battery cable. If the light is on you have a drain in the electrical system. Leave the light connected and begin removing 1 fuse at a time until the light goes out, that will tell you what component or circuit is draining the battery.
Last resort, you may have an alternator drawing the battery down.
Good luck and let me know.
Regards,
SOURCE: 1999 bmw 528i replaced battery and alternator
Replace your battery when its being tested there not testing it under a heavy enough load. A battery could have a dead cell in it and still show good on the charger. I've had that problem a few times.
SOURCE: replaced alternator and battery 2x and only works for short time.
This could be caused by a faulty voltage regulator, but since it has happened on more that one alternator, that can't be the problem, right? The next thing that I would look at would be a defective or loose belt. Also check the tensioner to make sure it is working properly and is keeping tension on the belt. If the belt is slipping or is worn out, it will cause voltage fluctuations. You may want to look at changing or at least inspecting the belt. Hope this helps and best wishes.
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