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a serpentine belt runs the alternator and the more stuff you have running (heat, lights, radio) it causes the alternator to have to have the belt run faster to supply power to the things that are running. if your belt is loose or worn, it will slip and cannot provide the amount circulation needed for the alternator to produce enough sustainable power to run everything at once. the belt itself runs several components, and if the Power Steering goes out as well, then most likely that you have a bad belt. you can always try tightening it with the idler pulley. but if the belt is too worn or stretched, then i recommend just getting a new belt entirely. cheap fix really.

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Q: Can a bad serpentine belt cause alternator problems?
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