I have static in both radios that goes away when I turn off the alternator. It is a Plane Power internally regulated alternator. The static is not the typical whine of a failed diode. I ran a separate ground wire from the alternator case to the engine block but no change. Now I have replaced the alternator and the static persists, still stops when the alternator is turned off. I am looking for suggestions...anyone have a similar problem and even better, a solution?