A new 30amp relay came via Amazon this afternoon, and I did a quick and dirty wiring job to get it connected to constant power, a ground, the ignition circuit, and the carburetor. It wasn’t pretty but the truck turned over, and more importantly, the Sniper unit stayed on. The engine didn’t catch, however, which is getting really fucking frustrating.
So next up, I’m going to pull the mounting plate I used to organize the auxiliary fuse panel, add the second relay alongside the first, and use that as my mounting point. Then I can run clean wiring from there.