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Does anyone know if I can tap into the wiring behind the rearview (OnStar) mirror to install a power cable for a radar detector?

If so do you know of a wiring diagram to indicate what colors the power and ground wires are?

Thank you,
I spent about an hour messing around with every wire combination and a voltmeter and i could not find a good switched 12v source near the mirror and ended up running it from the fusebox. :gfy:
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