I just purchased today a miller AEAD 200le welder. Serial # HE802574. The engine runs fine and the 120v plugs work but it won't hold an arc while welding. I don't know much about the internal workings of the machine so I tried to pull up the manual on here but it brings up a machine with a dial control for amperage and this is one of the old machines where you still have to switch around the cables. Anyone have any ideas what it might be or where to get the proper manual for my machine? Thanks