Does the Battery Charge When the Engine is Idling?

[ClaireDella]

Engine can charge the battery when idling. If the battery charging indicator light on the dashboard is not illuminated, it indicates that the vehicle is charging. If the light remains on, it signifies a charging fault, and the vehicle should be taken to a repair shop for inspection. Relevant details are as follows: 1. The car charging process essentially involves the engine driving the alternator (generator) to generate electricity, which is then rectified and regulated to provide a certain voltage to the battery. Typically, this voltage is slightly higher than the battery voltage (e.g., 14V, while the normal battery voltage is 12V), enabling constant voltage charging. 2. During idling, although the engine speed is low, it still drives the alternator to work, producing a stable DC voltage. Since the battery power is relatively not that large, the battery can be charged during idling conditions, albeit at a slower charging rate.