I am about to install an FM Modulator to my Rockford Fostgate system. The manual says to hook the wires up to the fuse box. I am planning on wiring it to the stereo harness instead. Does anyone know which color wire is for the battery and which is for the ignition? I have a repair manual, but I don't see the 03 Rockford system with subwoofer diagram listed in the manual. Any help would be appreciated.