Bought my JKU used and this is hanging from the driver footwell. I have a feeling it's aftermarket, but I have no idea what for. I have no exterior lights or anything. Other idea was some sort of cut off for the fog lights in high water? I dunno?!
Your best bet is to get a hold of the wiring diagram online and figure out what it's wired to by tracing it. It might be a valet switch for an aftermarket alarm, or start playing with things and see if you can figure out if it turns anything on/off.
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