Does An Alternator Always Charge. All too often the alternator is condemned as the source of the problem if only battery voltage is present with the engine running. Watch the engine rpm when the battery light comes on.
Many drivers wonder how their cars battery is able to keep its charge for many years and keep their vehicle in motion. When the battery is full the alternator stops producing electricity to charge the battery while still producing electricity to run the rest of the car. Took her for a ride down 405 for an hour and still the needle is charging.
If it does the alternator needs new brushes.
The alternator does charge your battery when the engine is running and the alternator is working fine. The alternator must be in a proper working condition. The engine basically turns the serpentine belt which in turn moves the alternator. In this case a cars gas engine spins wheels under the hood.
