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Yes! Back in operation! Thanks for the advice!

It looks like that's the only wire coming from the furnace. The other wires are in the big bunch going to the outer power box. Do I need to disconnect that, or just switch off the AC breaker...

I just bought a house with Central AC. I tested the unit initially and it worked fine. I just turned it on and the outside condensing unit is not coming on. I went out to look, and I see a white...