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[Bushytails]

I've never seen an intact-looking, good-testing capacitor with a vaporized lead... that's a new one for me. I'd assume it shorts with voltage, unless it somehow managed to dump enough HF across it to blow off a lead, which would be a fun failure...

I can't help too much with this project....

[Bushytails]

Before proceeding, have you sourced the mods? I haven't checked lately, but last time I tried, they were very hard to find, and cost about as much as a working machine....

[Bushytails]

I would do exactly nothing. If it eventually falls out the flops around, I'd use a piece of high-temperature insulated wire to secure it back to the body.

[Bushytails]

Usually a few whacks with a hammer will make it uncoated brazing rod... TIG usually uses silicon bronze, while torch brazing rods are sometimes phosphor bronze. Will it be a problem, that I do not know....

[Bushytails]

Please post the serial number of the machine so we can pull up the correct wiring diagrams. Also, I'm not sure what you're measuring.

[Bushytails]

When I think of a tube buggy, I think of something like this company's products: https://www.fabn801.com/products I think they have about a tenth the tubes! lol

But, as I said, I come from the crawling world, not the racing world......

[Bushytails]

Those look a lot nicer.

I'm surprised how many tubes one of those has... Is it really any lighter than a ladder frame?

[Bushytails]

Is the board beyond repair?

[Bushytails]

On an AC connector, you typically have Hot, Neutral, and Ground. Positive is only found on DC circuits. On a typical household 120V outlet, you'll have 120V Hot to Neutral, 120V Hot to Ground, and 0V Neutral to Ground. Ground doesn't carry any power normally, and is only for safety. Loads are powered...

[Bushytails]

The WC-1 doesn't have much in it, if you're trying to replicate one. It's just a power supply, a contactor, and a resistor+capacitor that provides run-in speed control. You could build a functional equivalent pretty cheaply. I don't know what voltage range the gun is happy with. Note that the gun...

[Bushytails]

The welds at the very top right of the third image concerned me the most... they look like zero-penetration booger welds to me. But, I'm not a great welder, so I may be wrong.

[Bushytails]

Dunno, I'm more of a crawler fan... 1-ton axles with 5.88 gears, rear steer, 3-link or 4-link suspension, t-case doubler would be my type of buggy...

[Bushytails]

Some of those really look like they didn't penetrate at all... also looks like it's been welded on by different people at different times. But, as to how bad it is, and whether it's easy to fix, I'll let someone who's better at welding than I am answer.

[Bushytails]

If the welder works fine without the burnt-out pump connected, I wouldn't assume there was a problem with the welder until after trying with a new pump. If it still doesn't work, then start troubleshooting the welder.

[Bushytails]

Does the cooler pump run if you connect it to a normal outlet?