I have not seen another thread for your hi beam problem
I think you will need to have at it with a volt meter, and start at the head light, or the battery and work your way point to point thru the wiring diagram, and see where you lose the 12V or the ground. Since the low beam works its probably not the ground unless the hi/low switch on the handlebar is wired to some wonky relay logic.
The factory service manuals for most Vstar bikes can be found online as a free PDF download file. The wiring diagrams are on the last pages. The only thing that is weird about them is they use odd letters for the wire colors on the schematic... like yellow is K or something... not what you would expect. You might also be able to find just the wiring diagram separately.
it could be as simple as a corroded push in wire connector between the handlebar switch and the fuse or headlight relay.
dont assume because you have 12V on one end of one wire that you have it at the other end - wires do break in the middle, or get crushed or severed.
Last edited by KCW; 04-18-2019 at 02:10 PM.