f5stop, I believe that the reference for the amp and fuse panel was for an H2 not an H3, but if I misread then my bad. I have actually been working on GM vehicles for 17yrs and if they are using a yellow wire for acc or rap that is news to me. I have seen pink, white, blue, brown, but never yellow. I typically do not tap into wires that are designated for single use accessories (like the rear wiper) as 1. the dealer will instantly blame your install for any problems 2. they can easily induce unwanted noise 3. many of these components are on databus lines now. I find that it is just a good idea to tap into wires that are designated to run many accessories or that are heavey current, dumb device (like the 12v constant under the seat). I will admit that my knowledge of the H3 is far less than that of the H2 or other GM vehicles of which I know more about than most of the dealers I do work for.
edit: just reread my post and I did say that the amp was unser the console--my bad!! It was late, long day, and I had just finished doing nav/rewire in an H2 so that was fresh in my mind. Now that I think back a few years, GM did use yellow for acc on some circuits like radio turn on, but it has been a few years!! Feel free to slap me again next time I drift into the wrong lane 
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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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