You gentlemen were correct, it is a Miller 250D, two cylinder diesel. He is asking $1000 on a trailer. He has no leads. How would I check out if everything is working ok? Could I put my electrical tester on it and verify output or must I buy the leads? I hate to buy leads and it doesn't work though I would hate even more to buy the unit and it doesn't work. I believe this unit can handle leads for stick, mig or tig, is that correct? What should i look for to verify the diesel is ok? Any other thoughts or idea are appreciated. I had a small Lincoln Mig that I lost in the fires out here. This unit isn't much more than replacing my unit and seems like it would do much more. Thanks.