This is what I have managed to cobble together from craigslist: OLD Miller Thunderbolt AC/DC ($100), a Hobart Advantage HF box ($100), brand new weldmark 17 air cooled torch ($50), and a 60cf argon bottle ($40). Looking to try Tig on Steel, Stainless, and Aluminum. My question is, what connects to what and does anything change for aluminum?

Welder has the following connection points:
AC:
Work
Hi
Low

DC:
+
-

HF Box has the following connections:
electrode in
electrode out
work

Here is what I think for Steel/SS:
Thunderbolt - to HF box electrode in
Torch to HF box electrode out
Thunderbolt + and clamp cable both connect to HF box work

I believe this should result in DCEN, please correct me if I am wrong?

And also, where to switch the leads to on the thunderbolt for Aluminum?

I would guess (for AL):
Thunderbolt work to HF box electrode in
Torch to HF box electrode out
Thunderbolt (low or hi) and clamp cable both connect to HF box work

Is this correct, is AL also EN?

Any help would be appreciated...

thanks,

Jeff