Okay... Mystery solved but I still don't have the solution. Last night I unplugged the LCD power connector (the multi function display) and the noise immediately went away. I plugged it back in and the noise was immediate and present. So, the noise is coming from the MFD. Once I discovered that little gem of info I called Moomba and spoke with Roger. He told me they were aware that some Moomba's and Supra's are known to have that issue, seems to be some type of interference that runs into the cable (perhaps near the throttle cable) and spills into the MFD cables causing the noise. He recommended using a Choke or Ferrite on the line to see if that would reduce the noise or interference, said it has reduced or eliminated the noise in some cases. So I found a local radio shack who just happened to have them and installed them last night, unfortunately the noise got worse or the same instead of improving. This morning I am going to try to locate the throttle wire and see if the ferrite will work there instead. Any additional advice would be welcomed. Also, as I have stated before, this is not a bad MFD because the noise only occurs when the motor is running so this is not a MFD problem but more of a wiring issue. Thoughts?