I think Don is right. Your alternator should be able to support everything. I was seeing my volt meter jump a little and did a few basic tests. I was fearful the alternator wasn't charging the battery.
Put everything on, Lights, ac, hot engine to trigger the fans, blinkers, radio, wipers then put a multimeter at the alternator stud it should support all that with no hiccups in my case it was a 13.6v with no fluctuation . Also with everything on check the battery mine was seeing 13.06v again with no fluctuation. your values may be different but at least you'll know.
Also a flir thermal image gun is great. they can be had for a couple hundred dollars and are super helpful. you can check the alternator and battery temps along with any lines.
Good luck.
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