Mig Problems.. Help !!!

[hr3]

I have an old Century 70 mig that has a problem.. All of a sudden when I went to use it last it tripped the breaker.. I opened up the case to take a look and all looks fine no bad or burned wires.. If I put it on low and turn it on it pulsated and humms for a bit then trips the breaker,,,on high it humms once and trips it too...

Anyone any ideas ???

 

[Shield Arc]

Maybe try rotating the drive rolls with some pliers while pulling the trigger.

 

[hr3]

I have tried this and have unplugged the drive motor and fan but it still does it....I,m wondering if it,s the rectorfier,s ?? and how to check them ??

 

[cqaigy2]

Don't know anything about Mig, but rectifiers are typically diodes connected together to allow current flow in one direction. Most multimeters have a diode checker that will beep in one direction indicating approx. .7volt drop. in the other it should be many mega ohms resistance.