On Friday, May 25, 2018 at 9:32:00 AM UTC-7, Terry Coombs wrote:
Â* I think you'll find that those 3 pins are neutral and 220 on the
other 2 , with either hot to the neutral at 110 .

Thanks Terry,

It is only a 3-hole twist-lock socket on the generator. Looks like I will have to crank it up and get the meter out. I seem to recall using it to power something 220/240v about 6-years back, but no idea what wiring I used.