I need to add an auxilary 12v power outlet on the driver's side under the dash - somewhere below the parking brake handle (doing this as an outlet for my gps power fm traffic receiver).

Can someone give me some advice on where I can most easily get an always-on 12v source in that vicinity? I pulled the door-jam trim piece and noticed myriad wires in the trough. Are any of those a good place to jump in for the auxilary plug (that source location is optimal).

If not, what dash trim panels should I remove to find power?

Any advice is greatly appreciated!