I've got a new Sony radio hooked up in my 57' GMC which has worked fine until recently. The strangest thing is that once the motor RPM's reach a certain level, the radio loses power. Once the RPM's come back down, the radio pops back on. The power wire to my radio is connected directly to my "kill" switch which is also connected to the ignition. I can't understand why the radio would be effected by RPM's? It is not vibration, ....I am convinced it is electrical. Thanks for any advice you can give! The rest of my elctrical system is perfectly fine. It is 12V. :mad: