Thanks for the info so far, does anyone know whether the wiring is already present in the harness? My diagrams seem to indicate this, I guess it would make sense to have the wiring present and then add the control module and switch.

Any more thoughts always appreciated,

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)