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2001 WJ/WG, 3.1TD VM Motori.
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I would test it for power, and see if it's of permanent power, comes on with accessories ignition (or run when engine is running) or needs a switch separate to ignition live (in which case, try looking at ohms/resistance for continuity).

If it's something you can utilise and not ecm/pcm controlled for example, then it might be a viable power source for an upgrade you might be considering.

If it's low left of radiator area when looking at your GC from the front, then I would lean towards it being connected to an e-fan controller, an air-ambient temperature sensor, an air pressure connector, or the relay for something like this. If it's fog-light related, I don't think Jeep had the looms with extra plugs catering for those, or else folk wouldn't need to buy a different loom with the plugs to upgrade- you'll have to double check though.
 
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