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It might be a sending wire for an unused accessory like full insturments. Does you car have full insturments of idiot lights? This is just an idea, hopefully someone can refere to a wiring diagram and let you know for sure. Since the check engine light came on when you grounded it, it probably is a sending wire which needs a ground to operate, if it had a voltage it would have probably blown a fuse. None of the fuses have blown have they?
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Dan
'77 Cutlass Supreme
'46 2 door
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