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On my furnace the white wire comes form the thermostat (26 Volts AC) and turns on the relay that runs the inducer blower and powers the ignition module. The 26 Volts then goes into a centrifugal switch on the inducer blower, through the limit switch, through the flue pressure switch and on to the ignition module that starts the ignition sequence. The wiring diagram should be on the door.
A meter that measures 26 Volts AC relative to chassis would be very handy
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Rick
88 Cab
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