re: Humidity Level New Construction

quote:

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I switched the black and red wire. I’ll see how this works. It came back on!

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That’s correct M1 is just a “dead” parking spot for a wire not being used to run the heat or cool. You might want to put the blue wire (medium speed) on the cool spade connector instead of the red (slow speed) to see if you get reduced humidity, as you have the potential to freeze the evaporator coil if by running the blower at to low of a fan speed. You are correct in that as a general rule the black wire is the highest blower speed.