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There could be many reasons for this, and although I can't recall all of them, here are some possibilities.
The alternator, or generator if so equipped, is defective and not generating any charging current, or not enough.
Even if the alternator/generator is good and working, it is possible that the current does not get to the battery.
The drive belt is either slipping or missing altogether.
The wiring system has a defect which prevents current from a functioning alternator from getting to the battery.
IF the vehicle charging system has a separate voltage regulator, it could be defective.
Another possibility is that the battery is defective and will not accept a charge.
These are some of the most common causes which come to mind. Maybe others can improve this answer with other causes for the problem.
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Why does battery drain while driving Volvo 940?
Alternator is defective or battery has a dead cell.
What may be the cause of energy to drain from a new battery while driving?
at the age of 13 and up
Why does may battery drain to car while driving?
Bad alternator or corroded or loose cables.
When is not a good time to not use ones headlights?
Headlights should not be left on while the vehicle is not in use. If you are not driving, you will just drain your battery while having your headlights on.
Honda z50 leaking fuel while driving out the drain hose?
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Does leaving the car on but not driving it anywhere drain the battery?
If the engine is running, then no. The alternator constantly keeps the battery charged.
What is causing your car battery to drain while driving?
If the battery, drive belt and wiring are okay then I would suspect the alternator is faulty. Your local auto parts store can test the charging system for you at no cost.
Why did your 1995 Subaru drain the battery?
Depends on if it drained while you were driving or ran down while it was parked overnight. If the battery runs down while you're driving the vehicle then more than likely the alternator is defective. If the battery drains while the vehicle is parked then the problem is either a dead cell in the battery or a light is on somewhere on the vehicle. Could be a under hood light, trunk, glovebox, dome, or even the brake lights. It can also be a relay that is stuck.
Will it drain the battery if you leave a Nintendo DS Lite on while closed?
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What causes headlights to dim while driving?
Your battery is weak, or your your alternator is not charging battery.
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You will need to replace your Asus Transformerpad T100 battery if it continues to drain the same amount as if it was in use. Batteries should drain less, not the same, while in sleep mode.
Will the Legacy Car Audio LBP22 Subwoofer drain he battery?
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