my other car wont let me do that as ecu knows currents being drawn,& causes probs. Yours might tho. try it,but be sure to put an inline fuse on the line.curious to know if it works ,let me know if u do try it mate.
ah hold on,on some cars the fuse panels have a little shunt clip thing,that lets you turn radio from "ignition on" power to radio,or when u move the clip,u then have option of permenant radio power.again,dunno if ford have this.some1 must know here