If I turn the start amps knob on the 250EX all the way to the left, is it off?
I'm trying to weld some very thin Aluminum and it doesn't seem to want to start and arc. just fizzles around trying. I've set the amps anywhere fro the lowest to about 30 amps and adjusted the start amps knob all over with no luck.
It weld fine and starts fine with more amps.

Also, I've turn the amps down as low as it will go and it says "9". I was thinking this unit would go to 5 amps?