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[Bushytails]

Hit it with some water and a stiff-bristled plastic brush, so you can see if there's actual damage or not.

[Bushytails]

Please post your machine's serial number when asking questions like this, as it makes it easier to make sure we're looking at the right manual. The first one I clicked looked nothing like your machine, so I clicked a random different one... which may or may not be correct.

From the wiring...

[Bushytails]

The tank fitting simply unscrews. It's usually 1/4 NPT. Use a socket on the hex around the surface that mates with the tank, with the regulator held in a vise with softjaws. I use yellow gas line teflon tape for such things. Be very sure not to wrap it in a way that any little bits of it get torn...

[Bushytails]

There's an issue with your question... from what I've seen on trailers, not much counts as odd anymore!

[Bushytails]

Diodes virtually always fail shorted, and read 0 ohms when they do. If you're reading anything not-0, it's probably normal, and just paths through other things on the pcb.

You don't need to include pictures of multimeter readings. That's really not giving any information just typing the...

[Bushytails]

My bad, I missed a picture, thought you didn't have PC2 at all. I was assuming you were in the US... here when the 400V units come up for sale, you pretty much can't give one away.

Run through the pre-power checklist in the service manual, and see if you find anything bad. Also, measure...

[Bushytails]

It doesn't have contactors. 400V-only unit.

[Bushytails]

IMHO, you're missing way too many parts to try to make a working welder out of that unit, especially since you can be sure at least some of the parts present are bad. Also, that's a 400V-only unit, which means some of the parts are not compatible with other units you may have, and the unit is pretty...

[Bushytails]

You have to ask? California, of course. VOC regulations....

[Bushytails]

Jumper the plug on the the machine to rule out a broken wire to the foot pedal or such.

[Bushytails]

I forgot about HEET... Denatured alcohol is illegal here, and I was looking for some to thin shellac with. The auto parts store might be the answer....

[Bushytails]

You may have to purchase a complete main body... But, as I said, your best bet is to give miller a call....

[Bushytails]

Give Miller a call.

[Bushytails]

Are you sure about the model of the feeder being M64S? I can't find anything about one existing.

[Bushytails]

Instead of getting a dual regulator, you can also get a tee fitting for your tank, and use any random regulator, like https://www.ebay.com/itm/Argon-Inert...2/262482298594

As to the actual question, I don't have enough experience...

[Bushytails]

I use CO2 for steel. It is _much_ cheaper, and works great.

Any inert gas regulator will work for a basic MIG setup. The ball-in-tube kind is great when you have long hoses and different guns and etc etc, but for a small mig machine, it's not needed. I've found US-made regulators to...

[Bushytails]

Yay!

I was hoping it was just the melted terminals, and it sounds like it probably was.

Thanks for posting an update - too many people just vanish after you help them and you never find out what the problem turned out to be....

[Bushytails]

I got a TigButton. You don't move anything. It's purely pressure that controls the amperage, so you don't have to move your fingers around trying to turn or slide a control, jostling the torch. I did a quick setup/review on it here: https://forum.millerwelds.com/forum/...ssions/608536-...

[Bushytails]

They were going to be my choice before I decided to go with a hand control. I might still get one of their pedals if I ever decide I don't want to use the hand control....

[Bushytails]

I've only seen SSC...
https://www.ssccontrols.com/product/...ontrol-pedals/ would be the one for a 14-pin miller, like a syncro.

If we're going to recommend specific brands, I love my TigButton. https://www.6061.com/tigbutton.htm...