Fuse panel directly inside the driver's door on the side of the dash, and I have never personally seen a yellow wire in a gm vehicle that is anything other than starter or other. Use a meter/light to test.
Do not need to go to the battery for headrest monitors. There are a couple orange wires in the driver's side fuse panel that are accessory 12v constant and are fine. There is also a heavy guage wire under the seat for the power seat motor that can be tapped. You can also get ground under the seat, but will need to go either to the amp (right inside the back panel of the center console) or to the under-dash for a switched wire. You really only need to go to the battery for heavy current draw devices.
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\'05 Slate Blue Sut w/ Magnusun, JBA headers, custom exhaust, 22\" MC2 RT5 wheels, Pioneer AVIC Z1 nav, Passport SRX, Vizualogic A1000 dual, bi xenons, fog xenons, dual optimas, and just gettin\' started!
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