What a coincidence CK, partner with the same machine as you was having identical problems just before the holiday break. Very similar weather conditions, cold and snowy and he was understandably frustrated with what was happening. After dickin' around with it for an hour, he took it in to his welder mechanic who just changed out the exciter brushes. Old ones were worn but had just a slight film of ice on them to give him grief. $25 for a new set of brushes and he was rollin' again. He was fairly surprised with it just being the brushes after checking them a zillion times and re-seating them too, but maybe with the snow blowing and cold fingers, a guy can overlook the obvious. Bob.