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One wire should be a 'hot' wire, one 'ground' and the two remaining wires would be a 'low' and 'high' speed. I believe that the Lincoln Mark VIII electric fan is a 2-speed fan. The four wires probably have something to do with the 2 circuits required for the 2 different speeds.

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Q: What are the 4 wires on a 97 Lincoln mark VIII electric fan used for?
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