ok i have an issue with my welder. It can run on 110 or 220. I almost always have it hooked to 220. Now whenever i turn it on when plugged into 220 it throws the breaker as if it were a dead short. If i plug it in to 110 there is a bank of relays i can hear them switching the lights come on but nothing else....? I'm guessing it is something with the power supply i should mention this is an inverter welding machine basically a big high current chopper...