how to check volts in plug

[Bryan]

Thanks so much for the info

[bobofthenorth]

Thanks guys!!! So the 3 wires coming off of my generator are probably (2) 100v legs and (1) neutral? Where is the ground? Thanks!

You'll need to confirm what you have with a VOM.  "Ground" on a genset is a bit of a misnomer but in practice its the frame of the generator.  Assuming your genset is wound for two legs of 110 and assuming this is an onboard genset that is more or less permanently wired to the coach then the neutral should be sized for twice whatever amperage the hot leads are sized for.  Whether that has been done and whether or not that matters to you is entirely up to you to determine.