Wiring diagrams?
 

I'm attempting to mirror tap my radar and cant seem to find any info on the wires up there.
Everything I have come up with was geared towards running a wire to a fuse box down either side or hitting the sunroof connector.
Isnt there a switched 12V up there for the OnStar stuff?

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Attachment 61668

Not for the onstar but there is on the sunroof. I would recc running a dual fuse kit at the bcm on one of the switched powers such as sunroof instead of tapping in the power at the switch but that's a risk you'll have to decide for yourself.

You the man. Thanks!