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Russ here feel the small draft motor when you try to start furnace. I may be bad. See if it is hot. Russ
Unplug wires to inducer motor.Put meter on ac colts.Call for heat at thermostat.Tell me of we get 120v to the wires you unplugged that go to inducer motor.
Very good.the old relay was most likely the culprit not sending power to the motor.Let me know if you have any more problems.