Re: Depolarized VP2030 alternator?
Must be a translation problem. One doesn't "polarize" an alternator. An alternator has no inherent polarity until the regulator gets added into the wiring, and then the polarity is fixed and permanent, based on the construction of the regulator. There's no way a mechanic can change that, or "re-polarize" or "un-polarize" it.
I'm guessing a VP2030 is a Volvo Penta engine, but that doesn't tell us what kind of alternator they bolted onto it, or what kind of regulator is being used.