Not sure for a HS but in general for Bally Williams games there are 3 separate wiring harness: GI, solenoid, and switching. I start with the GI after installation test for any shorts via multimeter, once cleared hook up to game an fire up, adjust. Repeat this for each harness.

So I'm thinking about what will blow up.

If your coil voltage is connected to your switches, you can damage the board.

If your coil voltage is connected to your general illumination lights, you can blow up your LED's or burn out your bulbs. Might also create a LOUD humming from the transformer. If you hear a loud humming from the transformer, immediately remove power!

If your coil voltage is connected to your controlled illumination lights, you can blow up your LED's or burn out your bulbs, and you can also damage the board.

If your switches are connected to each other, you'll have to find out where you've got inappropriate touching and get the short circuit resolved.

If a general illumination socket is shorted, it will blow the GI fuse quickly.

If a controlled illumnation socket is shorted it might damage the board, but likely will blow the fuse.

So my advice is to REALLY make sure there isn't anything touching inappropriately. Make sure wiring harnesses next to metal aren't rubbing through insulation. Make sure every wire is ONLY going to where it should.

I would test the lamp sockets for dead shorts, because it is extremely frustrating to have a brand new socket shorting things out. I don't expect you to have trouble, but if you don't have bulbs installed it's just a quick continuity check for the entire string of general illumination.

Because the coil wires are just a couple, I might do a quick continuity check between the coil wires and the switch wires and the lamp wires before I apply power.

Mostly I'd double down on visual inspection, and then plug it to the board and start pinball testing through the menus.