There should be a diagram from the part manufacturer.
My guess would be:
Rectifer yellow to stator yellow (OR stator white for slightly higher voltage)
Rectifier white to engine/chassis ground
Rectifier black to minus side of fan
Rectifier red to plus side of fan (fan runs when engine runs)
Alternate hookup:
Rectifier red to thermoswitch, other side of thermoswitch to plus side of fan
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2011 EC250E
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