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The meter is on the pole near the driveway. The line from the meter split bolts to the house and 2 shops. The house and shop 1 both have no problems, shop 2 has proper voltage on both phases until a load is applied. Once a load is applied there is a large voltage drop on 1 of the phases.
My question is what could cause this voltage drop on one phase. All that's in the sub panel is a 2 pole 20a, 1p20a, 2p50, and those feed a 220 plug, a 120v plug and a plug for a welder. The plugs, breakers, and wires to each have been replaced.
A poor connection.
A possible culprit here could be a poor electrical connection that is high resistance and when placed under any load produces a significant voltage drop. Be warned that a poor connection causing voltage drop produces heat.
Have an electrician look into this or have your utility check the connection at the pole.
Why would a switch be reading only 90 volts when its suppose to be 110?
The first thing I would do is check another outlet to be sure it is not a supply issue. I would not assume it is a problem with a switch till I checked other outlets(s).