I just got a new mower a few weeks ago and it has the 26hp LC KAW on it. The problem is that it causes a high fequency squealling noise on my peltors when I listen to AM radio. It does not affect FM signal. After listening to to it I have come to the conclusion that it has something to do with a voltage regulator? For example.. When I start the machine I can hear the squeal for about 10 seconds and then it goes away but when I engage the electric clutch for the blades the squeal comes back and stays until I turn off the blades. Today I hooked up a 12 volt sprayer and I would only hear the squeal when the pump turned on(blades not on). So it seems that whenever there is a voltage draw it cause the squealing noise. Any ideas on a fix. Could it be a bad ground??