broken wire feed

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I have a Snap-on mig welder, model #mm250sl. The wire feed adjustment is not working, and I need a wiring schematic to check the wiring on the adjustment switch.
Reply:Just a wild guess here, but possibly the "adjustment switch" is just a common potentiometer that can be replaced from radio shack.
Reply:I used an ohm meter on the switch and it has contenuity. There are a couple of unhooked wires, one white with brown stripe, one brown, that come from a wire clip plug. These same colored wires come out of the switch, but the switch is spliced into a blue wire. If I had a wiring schematic I could check the wiring. Do you know where I could get a schematic for this welder ? Snap-on # MM250SL. Thank you.
Reply:Originally Posted by garyweyermanI used an ohm meter on the switch and it has contenuity. There are a couple of unhooked wires, one white with brown stripe, one brown, that come from a wire clip plug. These same colored wires come out of the switch, but the switch is spliced into a blue wire. If I had a wiring schematic I could check the wiring. Do you know where I could get a schematic for this welder ? Snap-on # MM250SL. Thank you.
Reply:Try Larry at weld-mart.   He sells parts for snap on welders.http://www.weldmart.com/Millermatic Passport PlusMillermatic 200Millermatic 350P with PythonXMT 304 /w S-64 feeder and 12RCDynasty 300 DXVictor O/APremier Power Welder for my trail junk.
Reply:I believe this model was built by Systematics in West Chester, Pa. Try Milt at 800-ABC-weld (9353), or Systematics on line. weldersales