Polarizing Generator

[MAE]

Hello, I've installed a new generator but it came negative ground and I'm still positive ground. My question is: can I simply polarize the generator? I read where often this is done at the regulator but assume I can just deal with the generator. Could someone confirm how to quickly do this?
Dumb question but I assume if my battery is hooked up positive ground the polarization on all would have to stay or change to positive ground correct?

Thanks for any tips,
Mike