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MIG wire is always hot without pulling trigger

I have a Miller 185 MIG welder. Every time I touch the MIG wire at the torch end onto my work surface,  the wire will arch, without pulling the trigger. Any help will be greatly appreciated.

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  • Thomas F. Schneider May 11, 2010

    The transformer is partly shorted,or grounded . look for wires toughing the case.

  • vito macchia Aug 16, 2013

    makes a grunting sound and dims the lights in the shop

  • Anonymous Mar 29, 2014

    i have the pulse out set at 0 but the wire still comes out after the trigger is depressed

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  • 92 Answers

Check your manual, there are a lot of mig units on the market that are alway "Live" alternatively, the relay has either shorted or you have wirering problem on the switch.

Posted on Jan 23, 2009

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The part number you need to replace is MIL189486. If you don't have a sales rep from a welding store, here's the link to praxair, they will ship direct to your address via USP. Contact them by the 800 number or find your nearest location.
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