Found this with some google searching. I don't know for sure it is correct but was on another Ram forum:
Wiring Diagram & Pinout For 07' Ram Radio - DodgeForum.com
+12V: Grey / Red
Radio Ground: Black and Black/Light Green
Radio Ignition (CAN data bus) ** See Note
LF Speaker +: Dark Green/Yellow
LF Speaker -: Dark Green/Light Blue
RF Speaker +: Gray/yellow
RF Speaker -: Gray/Light Blue
LR Speaker +: Gray/Light Green
LR Speaker -: Gray/Dark Green
RR Speaker +: Dark Green/Light Green
RR Speaker -: Dark Green/Gray
Switch is the pink/white wire in the ignition harness....your cigarette lighter might be switching also...you will have to test to see
