Looking for 12V on an Expedition

[bocco]

This should be easy. I'm installing an XM MyFi in my 2000 Expedition and I cannot find a switched 12V wire under my dash.
I'm attempting to make the installation look as clean as possible. I pulled the radio forward to tap into the antenna wire with the direct FM adapter. I figured no problem. There has to be a 12V wire on the back of the radio. I checked each one with a meter and all I can't find 12V. Yes, the key was on. If I can hook this up to switched 12V it will turn on and off with the ignition key and I will also not have an extra adaptor plugged into my cigaret lighter.
Thanks
Gary

[ROZ]

2000 excursion
12volts yellow + ignition harness
Starter red/lt. blue + ignition harness
Second Starter
Ignition red/black + ignition harness
Second Ignition
Third Ignition
Accessory gray/yellow + ignition harness
Second Accessory black/lt. green + ignition harness
Keysense
Power Lock pink/yellow
Power Unlock pink/green
Lock Motor pink/black drivers kick panel
Unlock Motor pink/black drivers kick panel
Parking Lights+ brown headlight switch
Parking Lights-
Hazards
Turn Signal(L)
Turn Signal(R)
Reverse Light
Door Trigger black/lt. blue +
Dome Supervision
Trunk/Hatch Pin
Hood Pin
Trunk/Hatch Release
Power Sliding Door
Factory Alarm Arm
Factory Alarm Disarm
Disarm No Unlock
Tachometer white/pink instrument cluster or
Wait to start
Brake Wire lt. green + brake switch
Parking Brake
Horn Trigger dk. blue - steering column
Memory Seat 1
Memory Seat 2
Memory Seat 3

[Mr. Naudio]

12volts
yellow, grn/purple
+
ignition harness
Starter red/lt. blue + ignition harness
Second Starter
Ignition blue/lt. green + ignition harness
Second Ignition gray/yellow(2nd acc) + ignition harness
Third Ignition
Accessory red/black + ignition harness
Second Accessory black/green + ignition harness
this is for the 2000 expedition some are same as excursion
also not sure bout the myfi this morning but most xm portables are 6volt if thats true for the myfi it will say on the cig adapter if it is 6volt keep adapter on and hide it

[bocco]

Thanks guys, now I'll know what to look for. My goal is to hide the cig lighter adaptor behind the dash so I don't have a bunch of loos wires.

[bocco]

Thanks guys those color codes worked. It turns out it's actually easier to find 12V when the other end of the meter is properly grounded. Duh!