The location I have mine, and the way I have to mount it, makes it extreemly hard to mount it without it getting grounded. I have had my old 7747 mounted this way, and my current 7427. I have not had any issues in the couple years I have had it mounted like this. I remember reading this once before so I unbolted it from the firewall and let it hang down and set on the carpet (no ground on the case at all) and it made no change what so ever to how it ran. So I just bolted it back into place.