if I understand your predicament correctly, the positive meter probe should indicate the positive side of your charger with negative to ground. Wires with the white strip usually, but not always shows the positive side as well.
Use a voltmeter between leads. Most cheapie wire feed welders like this don't switch power to the torch, they just switch the gas feed and drive motor when you pull the trigger. So even though the trigger is not active, the electrode has voltage applied.
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