That is where I came up with my reply. Over a decade ago when my old 88 GT still had the AC system in it and I turned it on it went to that same drone you're describing. The stock alternators are garbage and they are also well known to catch on fire (happened to me, too). I'd consider the 130amp upgrade among the 1st things that MUST be done when buying a used 5.0 be it a Mustang or F-150, or in your case the Mark Pimpmobile.