video of my charging gauge...whats it doing?

"You" he sing -- songs are --- going -- to have---to tell us what you -------are ------working on-----so we don't have to guess............................

Some causes of this in no order

If you have the 69 / earlier mechanical voltage regulator, it is suspect

So called "loops" which can be difficult to run down This can be in either the ground or the hot side of the harness

"Voltage drop" in either the ground circuit or the hot side