Hi there have a Lincoln weldanpower 125 welder at present it's not giving no out put ,current at all ,if any one could just point me in the direction of what is the first thing to do look for or in any way assist it be most appriciated,what I did so far is check the slip rings on the amerture that's fine the fieldcoil don't know exactly how to check for continuity .with the wires and finally which wires do you use to excite the field .?