Years ago I would not have understood the wiring. I’ve learned some things and it now makes perfect sense. I recently helped a friend install a new heater fan switch that had settings for fan speeds of OFF - LOW - HIGH . The back side of the switch had a coil of wire secured on a post of steel at each end. There was another post of steel merely laying on the coil in the middle of the coil to make contact. The speed was determined by which contact point was used to conduct the current through the resistor wire. ( I realize that I’m explaining what you already know.) The guy I was helping had no idea how it worked or how to test if the brand new switch had gone bad (because it wouldn’t work after installation). We got it working!
Last edited by Lugnutz; 02/07/2023 1:40 AM.
