I have A solar mig welder that's About 20 years old when I pull the Triger you can here the gas feed and you can here it try to weld, but the motor that feeds the wire will not feed. even if you release the wire the wire feed motor will not turn. it started cutting out little by little if you would pull the Trigger it would feed then some times you would pull the trigger then let off and pull it Again if you could get it to start welding then it would keep Going now Nothing.

The capacitor(s) may be open. or resistor has failed. It is also possible heat selector is fused to the one setting.

Been welding for a while, open side, check for proper tension on the feed wheel inside side panel, hit the trigger, if feed motor continues to spin tensioner needs tightened or mig wire may be getting hung up inside main cable lead. If motor is off on off on then its probbably the switch on the trigger getting a bad good connection, hope this helps o and check welding tip on gun end, may need replaced if worn or melted, unscrews.

Yiu can use both innershiel and solid core wire. All you need to do is inverse the polarity for the innershield wire (gasless wire) connect the gun to the ground and ground cable to positive side.

Buy a Tweco mini gun part# 1000-1133 and an adapter part# 2500-2140, and that will solve your problem. Tweco parts are available at every Praxair location.
Get rid of the solar gun.

Call your nearest Praxair store and ask for the replacement, they should be able to get it for you.

try changing the tip and make sure your ground connection is good on the steel and in the machine sometimes the ground wire in the machine comes loose

These welders have thermal breakers in them so if they get to hott the will automatically stop feeding the wire but the fan will remain on, try changing the breaker i think its in the door where the spool is held. good luck]

Inside your machine just in front of the wire spool is an adjustment to increase the tension on the wire tighten it a little bit at a time until your wire feeds

Look on the front pannel. thier should be a "latching Switch" indicated by "4 X 2" little arrowes. The 4 is " pull the triger -- the release the arc continues, the "2" is pull the trigger and the arc startes release the trigger the arc stops simplesssssssss
Ken

a mig welder must have a good ground to work, also dont try using rusty wire it will jam in the liner, have you checked you are getting wire feed from the neck? just pull the tright and with the welder on it should feed out, if you can stop it its to loos tighten up the pinch roller, is there power on this wire feed? i have often seen new welders strick up the weld with to slow a wire feed and to many amps running, what happens then is it burns the wire away in one flash, right up inside the welding tip and every thing comes to a grinding holt then???? it can and often will just weld the wire into the tip,, witch may mean a new tip is needed, take off the shroud and try to unscrewing the tip if no wire comes out when you pull the triger
as the wire is stuck or welded to it you may be able to get it out still??? but its best to fit a new one in, go one size bigger than the wire your using at first as you are sure to get it very hot??? untill you get the hang of welding,,, use a good gas mix like argon light it will weld stanless steel as well?? but co2 works well on miled steel only, the problem with co2 is its a cold gas and you need a lot more amps to weld the same thickness of steel use it at about 2 to 4 psi only indoors, out doors use it at 4 - 6 psi and if out doors keep out of the wind as much as you can or it will only blow the gas away from your weld if that happens you cant weld without gas being there as a sheeld, dont try using a no gas welder they are like the devel having a bad hair day to use,
even a good welder wont like one? there c*ap!!!!
only try welding clean steel not rusty steel or it will spit like mad at you and you wont get a good weld,
if at all,,one of the most common fults that is
but i bet you have weded the wire to your tip?
its so easy to do at first,,only two word of warning
keep well raped up, sparks well fly and were gloves',,,
and keep your head sheeld on well over your eyes dont ever ever look at the welder when welding it will burn your eyes realy bad and you will wake up in the night feling like some git has just pored sand into your eyes and its going to hert like hell for day's,,,
i find the solor head sheel is far better, its nearly clear when not welding and go's dark in milliseconds you will like them as you can see what you are doing right up till you strick up the ark then it go's dark,,
most welders last for years iv had mine for the last 35 years it a clark 150 turbo mig, and iv doged it to death too,,,
the only thing that could realy go wrong inside them is the rectifier, mains coil or a relay,, not much left in it to go wrong ,
and now iv bored to death good luck with your welding ,,i hope this has helped you out