I bought a direct replacement blower for my furnace but when it arrived I noticed two wires were crossed. the original motor has a red, white, and black wire in the connector. The new one has a fourth (blue) wire and it is in the slot where the black wire is on the old motor. Would it be safe to assume that this blue wire can be removed and the black wire moved into the same spot without causing problems? The old motor had a green wire connected from motor chassis to fan housing.
I managed to find a photo of the old motor and found an image of the replacement online. Hope this helps, thanks for all the help.