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thanks, yep it is alu wire, i will go through all conections and give them a spruce up, rectifier seems ok using diode test on multimeter

thanks will try that also :)

thanks tom, thats a point i do need to put a washer on my spool but im not sure thats the main issue as if i press the trigger without welding it runs smooth again, making me think the issue is electrical, thanks

thanks have started new thread

thanks have started another thread to troubleshoot

Hi i have an old sealey mightymig 90 auto with feed issues, it runs fine for a minute or two then progressively gets worse at feeding the wire, becoming very jerky. i have replaced the electrolytic caps on the drive board so far with no improvement, also tried new tips, new liner, rebuilt feed...

hi dont think its a cap as doesnt look like one and wrong symbol on circuit diagram, could well be a mov though as has same symbol as thermistor on circuit diagram, in which case its testing good and means i have to look else where for whats causing issues, thanks

Hi im having some issues with my old 1989 sealey mightymig 90, i have removed what i believe to be a thermisto that is across the rectifier and it is testing open circuit/infinite ohms. i have the instructions attached which shows what looks like the thermistor symbol in the circuit diagram but...