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I have a 1968 double burner gas central forced air furnace and one burner dose not ignite and the one that does cuts on and off . I replaced the basso switch on the second burner . still does not cut on with new basso and thermocouple I can ignite by crossing the two wire connectors but it will not remain on Any suggestions? ( thermostat is not defective but only one burner cuts on when I turn up the temp on thermostat)