And on our engines, in case you were wondering, only the A/C, Alternator, and Power Steering are belt-driven. The only one that is really any cause for concern is the alternator at idle possibly not giving enough charge for your load and causing battery drain.
But... you have to consider that the alternator's output at idle is designed to handle every electrical load in the car all at once plus some aftermarket addons and then some safety margin as well. Unless you're installing a huge audio amp, and then running it at full volume with the window defrosters and headlights on, constantly rolling the windows up and down, with several amps of crap plugged into your lighter sockets, I don't think you have to worry about it.
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