The fact that it flickers rapidly indicates that it's a very momentary problem. I'd check every hot connection I could. Some connection somewhere is breaking down under high demand. It could be at the alternator itself. Also, I think it's too brief for your digital readout to see it, so to speak. Besides, by the time it cycles through it's system checks, the problem is gone.
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2005 Excursion XLT 4x4 with 5.4 3V & 4R100
1989 F250 XLT Lariat SuperCab 4x2 with 460 & C6
1987 Crown Vic Two Door with 5.0 & AOD
1986 Yamaha V-Twin Virago 1100
For my sanity, please try to use punctuation and capitalization. I try to help the people who post, but it's impossible to do when the post is indecipherable.
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