The Voltage regulator IS NOT what gets/needs Polarized its the Generator that requires Polarization so it matches the batteries Polarity (+ or - ground) to charge it.
HOWEVER some VR's wont work correct at the wrong Polarity i.e. they may be for Pos or Neg ground and if its a Solid State VR it needs to be for a specific ground, usually Neg.
THEREFORE if the VR is for Neg ground ONLY and, of course the battery is installed at Neg ground, the Genny needs to be Polarized at Neg ground BEFORE starting.
A typical tractor DC genny can work at either polarity once polarized, you just need a VR that works at the polarity you choose (some will work at either many not so) and have the battery installed to match.
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