Thanks for the reply. I did find one, and added a wire to the harness for the switched power, not surprisingly it's the pin right next to the constant power. However, it still won't turn on when I give it power on both the constant and switched pins. Did you have this problem? I cracked the radio open and as far as I can tell the switched power pin is attached inside and connected to some circuit on the board. I wonder if you have to desolder that eeprom before it will recognize a signal from the switched power source?