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Out of curiosity have you tried unplugging the main fuel pump, to see if the pump itself is causing a voltage issue? I think you may want to try to find the source of the problem by progressively removing items from the circuit until the issue stops.

Ah, I see! I watched the video during a meeting, without sound... ( I was trying to 1/2 pay attention to the meeting! ) So I didn't realize you were switching the lights off! The flickering towards the end of the video seems more indictive of a failing voltage regulator. You will need to watch...

Woa! that flickering at 1:15 is no alternator voltage fluctuation! it's more like a total loss of voltage, the lights go virtually OFF completely. There's no reason that should be happening with the batteries and alternator in tact. Does everything else DC related sound ok when that happened...

To charge a 24V system you need about 27-28V ( typically you need 13.6V per battery ) so I think you are in the ballpark. The only issue could be the speed of the fluctuation. Your alternator output could be swinging drastically rapidly ( often exaggerated when hot ) yet a digital volt meter...