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I picked up a hitch, wiring harness, and tow module off an '05 Cayenne S to install on my '09 Cayenne Turbo S this past weekend, but I noticed it had a secondary harness tied in near the plug. Does anyone what each of the wires is for? The blue wire in the picture wasn't tied into any of the main harness wires and I'd like to know if that's going to cause me any issues.
