I am not entirely familiar with your situation but I think the picture below will help. Most fans come with three wires and the configuration of the wires is important. Many fans will not suffer adverse consequences if "+" and "-" are reversed - the fan will turn on but rotate backwards if you mix + and -. But if you connect power to the tachometer signal pin you may make the fan inoperable.
Note the orientation of the tabs on the connector so you can identify the correct wires.
Hope this helps. I'm sure others will add or correct as needed.
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Lucius and Danielle
1992 29' Excella Classic / 2010 Interstate
2005 Chevrolet Suburban K2500 8.1L
2018 GMC Sierra K1500 SLT, 6.2L, Max Trailering
Got a cooped-up feeling, gotta get out of town, got those Airstream campin' blues...
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