Thank you Gentleman,
Let me try to describe a bit better:
They have fed a 100 amp, single phase electrical panel via a 8/3 SO cord to a 3 phase generator. The generator and the panel are an estimated 100 feet apart. The SO cord of course has three insulated conductors running in it.
They have fed the panel in this way. Two insulated conductors have been landed on the A and B phase. The third conductor is landed on the ground bar of the panel. The ground bar is solidly bonded to the can via its 8/32 screws.
The panel is feeding a submersion well that is running on 240 volts. The well runs through a well controller. The well controller is fed via a two pole, 30 amp breaker in the panel.
I was asked to just come over and make sure the generator was giving correct readings before they turned it on for the season.
With the generator running, I took readings at the distribution panel. I had 240 volts between the A and B phase of the panel. (Good) I had 120 volts between A phase and the ground. (Good). I had 220 volts between B phase and the ground. (Hmmm). I closed the door on the temp panel, walked the 100 feet to the generator and shut it off. I opened it up and looked for the wiring diagrams. Sure enough, it was wired in a center tapped Delta. The diagram shows the center tap between L2 and L3. They had two phases landed on L1 (black) and L2 (Red) I swapped the red from L2 and landed it on L3. I closed up the equipment, turned on the generator and walked back to the panel. As I thought, the A phase of the panel still had a good reading between phase and ground. (120), but to my dismay, I still had a 220 volt reading from B to ground. This was/is a bit of a puzzle as I have swapped the suspect phase over to the other leg.
Additional background: The generator frame has been grounded via a ground rod, but the small panel was not. (No ground rod was driven)