OK so the 528 won't work for me because the acc voltage drops, it doesn't completly cut out. Somone mentioned about wiring a normal relay to the alarm so the radio only gets acc power when the alarm is disarmed. I kind of like this idea because then the radio will turn off if I leave the car running while running into the store. Anybody know what wire I would need to splice into on a viper 5701 to accomplish this?