NEWBIE QUES. -'03 Yukon: Which Wire is 12V+ Switched?

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PJS3

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This is probably the simplest question to others, but I just can't figure it out. I can't seem to find a wiring diagram for my '03 Yukon anywhere online...

I'm installing a Parrot 3200 Bluetooth Adaptor (finally, someone will get a hit on these terms in future searches for information on the site... I was coming up BLANK:umn: ) and the only real electrical connection I need to make manually is to a 12V+ SWITCHED LEAD. The quick connect harness makes all other connections a piece of cake... It's just the power that I need to connect. I can't figure out a SWITCHED 12V lead to tap into...

I don't have any electrical testing tools by the way.

Can someone PLEASE tell me:
1. Where exactly under the dash I can find this wire.
2. Exactly which wire is it on my 2003 GMC Yukon x/Bose, On-star

Again, probably a very "simple" question, but admittedly I'm green on this truck...
Any help is/will be greatly appreciated!
 
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