First off, we needed to get the manual for it. Fortunately, the Lincoln manual already had the pin-outs for its accessory connector, and Miller is very good about letting you download their old service manuals.
From the manuals, it appeared that the Spoolmatic needs a 35V DC power supply, a realy, and a simple RC circuit to provide a power-on delay for the motor. The Lincoln seems to just need triggering, which we can do with a second set of relay contacts.
The next problem was finding the right MIL-SPEC connectors. The one on the Miller was a 4-pin AMP, and I was able to locate this fairly quickly on Digikey, as most of these are type 97. FYI, the female pin part is:
AMP#97-3102A-18-4S
The 12-pin Lincoln connector was a little harder to track down, but I made a guess that it's also an AMP and found it as:
AMP#PT06A-14-12P(SR)
Next, I made a quick board layout in Eagle CAD and etched a board using Fab in a Box and a laser printer:




And here it is stuffed:


So far, I've got it activating the welder and spool gun. The next step is to see why it isn't auto-sensing spool gun vs. MIG gun. But this isn't bad for one evening of progress.
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