Posted 1/9/2026 17:15 (#11503464 - in reply to #11503403) Subject: ^^^^This^^^^
St. Joseph, Champaign County, IL
Assuming it's a duplex, grinder in one half of duplex, and tester in other half. If voltage changes significantly when you turn the grinder on, there's a bad neutral connection/ wire somewhere.
Edit to add: 220 volt loads, like motors, won't be affected by a bad neutral, so they'll work exactly as they should.