40 DC volts at the stabilizer at weld speed ? If so check all your weld output connections. You should see open circuit voltage at the output sockets.
Open circuit voltage is listed on the front panel of the welder. I have seen slight corrosion or arc damage on the course current rotary switch cause problems, also look at your fine current control pot.

 

I did find that the rheostat head had broken off the arm. Ordering one today. Hoping that is the issue. I only paid 300 for the machine delivered. So I have some what of a repair budget.

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Changed out the rheostat and still no power to leads. Ac or dc. Power everywhere else. But nothing at the leads. Dc neg I do get -50v reading.

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I had a 225G Plus that had this problem. Under the 50 A outlet there is a reset switch with a rubber cover. I found if it was tripped it would not make welding power.
Yours may not have that since it is a straight 225.

Dan D.

 

The weld selector switch was bad. I changed it out and did 1 wire at a time. Now the switch arcs when I start it up. Does anyone have a layout I can make sure my wires are in the right place? 10, 27, 28, and 30 are hot when I touch them

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You may have one or more shorted diodes in the output rectifier.

Got a unit SN?

 

Ma230134h

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Follow the lead/switch connections in the circuit diagram on page 50.

https://www.millerwelds.com/files/owners-manuals/O4434P_MIL.pdf

 

Got it going. Started with a bad rheostat. Then the selector switch then 2 wires were too close after I installed the switch that it was grounding out. I appreciate all the help.

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Good catch and good job getting to the bottom of the issue.

Thanks for reporting back on the fix.

 

If not for y'alls help and wisdom I might still be chasing it. I appreciate it

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Something to remember is every so often rotate the fine current pot from zero to max, most of there life is spent within a short range of sweep, and then can oxidize.
Its also a good idem to do the same with your range switch as well as AC-DC polarity switch for the same reasons.

 

I appreciate the advice. This is my first real welder genset. I always had company supplied welders. I came across this one for 300 and couldn't pass it up. I work on heavy equipment and just set off on my own business venture. So y alls help is priceless. I've also acquired an hf251d for free wheeling and dealing.

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Awesome "deal" on the HF unit. Will work just fine with the Bobcat for aluminum TIG but with no remote amperage control it's a little tricky getting used to.

 

Just a starter tig box for me. Once I figure out tig is something I enjoy I'll upgrade. Down here in sw florida, if you keep an eye open you can get great deals.

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