6 volt alternator problem

[DeBordEngineMan]

Me again guys I have a 6 volt positive ground alternator and I'm pretty sure it isn't working. Before letting the tudor sit for 5 years I can't get the alternator to work. I always had to Rev the engine up a little bit to excite the fields to show a positive change on my amp meter I have a reproduction 6v horn and it always sounded sick and would not aooga till I reved the engine up which would be correct for a self excited alternator. I think? But it started before I parked it not showing a output on amp meter. I have tried to excite the fields with a jumper wire but no go so I thick the alternator is dead in the water. Question is should I buy a rebuild kit that you can get for a 12v alternator that changes a 12v to a 6v positive ground since I already have a alternator already set up for the 6v positive ground or just buy another brand new 6v positive ground alternator that's good go? Is there anything else that the convertion partr not make it work again? Thanks Robert