"This generator was just gone through by a re-builder that has done a lot of work for me over the years, I am banking that this generator has the polarity correct."
That's not necessarily so. He could have polarized it at Neg ground like late model cars use orrrrrrrrr the could have polarized it at Pos ground like many old tractors used
NEITHER IS RIGHT OR WRONG it can be polarized correct at Pos or Neg. But if you hook it up and start it and the genny was at opposite polarity from the way you wired it ITS POSSIBLE TO FRY THE VOLTAGE REGULATOR.
"I am a little bit afraid of messing something else up."
YOU DO NOT MESS UP A GENNY BY POLARIZING IT TO MATCH YOUR SYSTEM it can work at EITHER polarity... But if its at the wrong polarity because you were afraid to polarize it correctly to match your system YOU CAN MESS THINGS UP (the VR)
You can still polarize the genny even if the VR is hard to get to. Simply use a jumper wire etc to momentarily flash jump from the hot ungrounded battery post to the gennys ARM post (for a Class A system) The genny is what gets polarized NOT the VR
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