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Changed polarity on the rossi 220 amp mig welder but still won't weld

Changed polarity form negative to positive

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  • Timllfixit Dec 06, 2014

    I've seen your reply and still say you need to check the heavy relay. Take off the side cover and look into the bits around the transformer coil and you will see a large domestic/industrial contactor. When yo press the trigger this relay should operate. If it doesn't and proves to be defective they are available from electrical wholesalers or ebay. Look at the rating and match it. You don't say whether when you swap the leads back that it works? Give it a go and write back.

  • Timllfixit Dec 06, 2014

    I forgot to say, has it the capability of using both methods?

  • Timllfixit Dec 08, 2014

    On Jan 29-2014 a guy called John Thompson gave chapter and verse on how to convert from gas to gasless on a similar machine.. It was in the MIG Welders section. I don't know if you can search previous topics but if you put in Rossi mig welder you may get lucky?

  • Stephen Hemsworth
    Stephen Hemsworth Mar 10, 2015

    I have the same issue. I have changed the polarity- wire does NOT feed when i press the trigger (inching button works ok...) I get no spark when i touch the wire to the workpiece... Please help -do i have a DUD?



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What do you mean "it won't weld" ? Does the wire come out when you press the trigger? If so and there's no spark when you ground it then check the heavy relay that operates the heavy juice. Tell us what you have done and tried so far.

Posted on Dec 05, 2014

  • 1 more comment 
  • geoffrey hoad
    geoffrey hoad Dec 05, 2014

    yep thats right the wire feeds out but there is no spark this is after we swapped the negative and positive over as we are trying to use gasless wire.

  • Stephen Hemsworth
    Stephen Hemsworth Mar 10, 2015

    I have as similar issue. I swapped the polarity - no wire feed when i press the trigger -(inching works), no spark at work piece. HELP! what can i try? (or have i brought a lemon???)

  • Timllfixit Mar 10, 2015

    Guys, I think you have to consult the owners handbook first to see if your machine can do reverse polarity. Its not a given on all machines. I think we will need machine name,model, spec etc before we can help further.



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