I believe there is a grounding wire connected to the exhaust system. Might it be that wire?
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You know, it was in the right area, and was thick enough to be a ground. Not a bad thought actually. I wonder why it would be hanging down like that. I had never noticed it before.
The weird thing is, the mechanic at Infiniti couldn't tell me what it is. I am inclined to chalk that up to him being young, but still, very odd.