Hard to hear but does sound like a belt. Have you checked the belt tension? You don't want to over tighten them, especially the alternator belt. Push on the longest section of the belt. It should deflect about 1/2 inch or so with moderate pressure. You shouldn't see any belts 'flapping' with engine running. You could also try a little spray on belt dressing, to see if it is a belt.
I noticed the video of a 95 Fleetwood Bounder, is that yours? We bought a 95 Bounder, 31', last year.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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