NP. As Ghost said take a reading at idle & get your voltage off the battery with no accessories on Should be >13 volts. Then turn everything on, all lights a/c on full & radio to provide as much currant draw as possible. If the idle increases & the voltage on the battery drops, it means that you alternator is not charging enough. The revs are probably increasing trying to generate more charging power from the alternator because it is not keeping up.
GL
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