I will check that when I get back out there, but the trouble is with a 3 phase pump that does not use a neutral. There are several lights in and on the pump house, regardless of pump running or off these lights never flicker. The line to neutral voltages are rock steady, just the phase to phase is out of balance. No corrosion problems that i can see, this is an older well with a galvanized steel well casing which is bonded to the ground rod and the re-bar in the building slab. The control power is derived from a transformer inside the pump control, I guess they used a transformer to get a neutral because they did not pull one from the main load center.
