Snap on pro mig 187 low on power ?

  1. eddie49 Member

    Did you try the 3 x car headlamp bulb load test?
    I'm beginning to suspect that the transformer primary isn't getting full power in. You'd need to trace where the AC mains goes into the primary when the mains is on, the trigger is pressed, and the power selector switch is at the highest setting. Then disconnect those wires and rig up a direct 13-amp fused new mains lead direct in to the transformer at those points.
     
    123hotchef likes this.
  2. anto44

    anto44 Member

    Messages:
    1,385
    Location:
    ireland
    Check the voltage selection switch, I had a similar problem with my snap on promig and it was the contacts in the switch had burnt out. I think I still have the old switch at home I'll get some pics if I do. There was a big voltage drop across the switch.
     
  3. johnny Member

    Messages:
    18
    Ive had a look at the power setting switch...i cant see any burnt connections..
    I measured the ac from the transformer..it was 24 volts..
    Im sure it was 26 the last time i measured it..?
    Not tried the bulb test yet eddie...
     
  4. johnny Member

    Messages:
    18
    Ive inboxed u eddie
     
  5. anto44

    anto44 Member

    Messages:
    1,385
    Location:
    ireland
    My switch looked perfect from the outside it was only when I did a voltage drop test across it I found it was faulty and only supplying about 150-160 volts to the transformer.
     
  6. johnny Member

    Messages:
    18
    Really...can you still buy the switches..?
     
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