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If it were mine I would take my multimeter, set to Ohms scale (x1 range)..
With sail switch installed remove both leads and place meter leads across the connections on the sail switch.. should read OPEN .. no continuity
Now have helper turn on the furnace with meter still connected and observe the meter reading when blower motor spins up .. should read close to 0.0 ohms
If so then you now know the blower is moving the paddle arm enough to complete the circuit and can focus your troubleshooting elsewhere...
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