Looking for a switched power wire for accessories

HI all!
I'm trying to hook up a Sirius FM modulator in my Envoy and I can't seem to find a switched power wire to tap into for the switched power in the modulator. Has anyone done this before? Any help would be appreciated.
Thank You,
Brian

Switched power is actually a bit difficult to find. But I did this research a while ago for another place and it may help you out.

Do you want it on in ACCY+RUN+START modes, or ACCY+RUN or RUN+START or just RUN?

Each of those has a circuit controlled by the ignition switch that feeds various banks of fuses in the front and rear fuse block.

Typically if you need one of those signals, you use an add-a-tap fuse gadget to the fuse block.

http://ecx.images-amazon.com/images/I/21wAMu2jHsL._SL500_AA250_.jpg

If you do go into the ignition switch:
RED on the ignition switch is 12V, fused by underhood fuse #34, and feeds the following three circuits:

White is hot in ACCY, RUN, START
Orange is hot in RUN
Yellow is hot in START

RED/WHITE is another 12V, fused by underhood fuse #36, and feeds two circuits:

Brown is hot in ACCY, RUN
Pink is hot in RUN, START


If you go after the fuse block path:

On in RUN/ACCY modes only:

rear fuse #29 - Rain sensor (rare option) 10A
rear #33 - front wiper motor - 25A
rear #31 - TBC ACC - 3A

ACCY, RUN, and START:

rear fuses 47 (IGN 0)
50 (TBC IG)

RUN only mode:

front fuses 22 (IGN E)
16 (TBC IGN 1)
27 (BACKUP)
28 (PCM 1)
54 (AIR SOL)
53 (O2 A
54 (O2 B)
26 (ENG 1)

Thanks Roadie! Looks like I have some work to do now! :)