It's no wonder that any of us old timers made it up to this point in life because back in the day, there wasn't three wires pulled to every outlet, or device and/or unit within a home, garage, barn, so on and so forth.
Yes, just like everything else in life, things do change, and usually for the better for a wide variety of reasons.
Look, our totally enclosed wellhouse was built in the late 1960's below ground level and later electrically wired for a well water pump, cabin and outhouse.
When I first moved here in the autumn of 2015, top on my list of things to do was to get rid of all the old electrical double pull lever, screw in mogul base 30amp fused disconnects inside the wellhouse, plus nothing had any kind of a ground wire connected to them.
Afterwards, I installed a 100amp electric subpanel that I already had within my inventory and grounded everything to the main water line, not to an outside ground rod.
Then I installed a brand new 240v 40gal electric hot water tank inside the wellhouse. That subpanel continues to feed the cabin and the outhouse as well still.
I shared some photography of the work completed in a previously unrelated TOO thread. Hyperlink below if at all interested in checking it out.
Now, the current service wire for all of that stuff is a 10/2UF cable. The ground wire within that cable is connected to the main neutral bus at the main panel, and then to the new subpanel neutral bus within the wellhouse.
Not exactly what I actually need, but manageable for the time being because a complete replacement would call for a new 130' ditch to be dug to the main panel.
When I go to build our new home, that's when the entire place will get rewired up to today's standards. Each of the five out buildings will also have there own subpanel. Until then, what you see below is how I have it wired today within our wellhouse, and yes, it's much safer and functional than ever before.
Am I afraid of a fire or any kind or an electrical shock? Hell fucking no! Water makes a much better path to earth than I, always.
Hope you get it your electric issue all straighten out, Clay.
Good luck!