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alternator at idle
>When the engine is running, the alternator should be supplying the
>electrical needs of the car, including the idle system. So why is it
>that battery voltage would play a role?
>- -Douglas Hurst Quebbeman
Because at idle, the alternator does not produce enough electricity to run
everything - (generators are much worse).
Once you rev the engine slightly, the alternator produces enough power to
run all our power and heated doo-dads and charge the battery as well.
If the battery voltage is low, something somewhere senses that and raises
the idle slightly so there's enough electricity to keep everything lit up