How to use a multimeter to tell which one is red?
I borrowed a multimeter from a co-worker, but then I realized I've only used one for DC... not AC. So basically I have no clue what I'm doing.
My goal is to determine which of the two unlabeled, gray wires attached to my thermostat is "R" and which one is "W".
How would I go about doing that with a multimeter?
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