Re: wire above heater box?
x2.. can't see it. Trace it back and see where it goes. There isn't much on the passenger side of the dash except the heater resistor plug, the white wire to the right dome light switch, and the orange wire to the glove box light.
Only thing dark blue I can think of in that area might be a rear seat speaker wire??
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Still looking for that elusive 76 Nova SS.
People who have nothing better to do than b!tch about signatures need to get a life.
70 Chevelle L78/M21
10 Avalanche LT 1500 4wd