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Does Idling Engine Charge Battery. Not usually Typically the alternator is not turning fast enough to charge the battery A vehicles electrical system is constantly consuming power while the engine is running at an engine idle the current produced by the alternator is usually not enough to keep up with the dema. The battery goes down to 2 bars and the engine has to kick in to charge the battery.
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As revs pick up and reach the cut-in speed where the alternator starts charging the battery the alternator will output more and more current and eventually output its rated current ie. I have no check engine. Basically at idle you can probably get 80 amps out of your alternator.
As long as the mechanical action of the alternator is taking place.
3 Mendel Leisk May 23 2020. 4 Jan 1 2012. Lead-acid batteries which are used most commonly in cars require only the amperage provided. So basically letting your car idle must not drain your battery.
