I have a single blue wire like that in my 69. It goes under the carpet, up behind the heater box, then just under the top panel in the dash and terminates at an open connector. I am sure it is an original factory wire because it has one of those plastic clips that holds it in place under the dash top panel. I am guessing its for a rear speaker too.
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1969 Lemans vert, matador red, 462 CI, 3.07 12-bolt posi
1974 455 TA, admiralty blue/red interior HPP "cover car" - sold
"The best way to show a car is to drive it"
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