Hello all you good people.

I'm having a bit of an electrical issue with the dash lights. It's a base v100 225. New alternator, light switch, electronic voltage regulator, starter relay, dash light bulbs, auto shift indicator light bulb, turn signal and oil temp bulbs. I pulled and cleaned the bulkhead connectors, replacing a few pins. It has a new electronic ignition and MSD coil.

The problem: after disassembling the dash and electronics and reassembling them, the dash lights no longer work. When you pull on the headlights, and have the dimmer switch turned all the way down, the lights are off. When you turn up the dimmer, right before the domelight clicks on, it pops the fuse. Checked over the wiring, confirmed the cluster ground, installed another battery to body ground strap, new engine block to body ground, all the lights, taillights, turn signals work.
I made no alterations to the wiring harness.

Some, perhaps, unrelated yet important electrical aspects. I have an alarm wired into the taillights, dome light switch, and ignition wires. I also have a radio and amp direct wired into the battery, grounded to the body. Neither of these items pass through the stock fuse box, they have there own fuse box.

Any tips?

I assume that you mean that the fuse for the dash illumination lights "pops". Take your symptoms- dash lights don't work, & fuse pops when power feed to said lights is turned up to "hi"- you have a short (connection to ground or high current draw) in the light circuit.

So you need to look at all the orange wires coming off that dash light fuse- that could be the trans shift indicator(automatic), all the instrument lights, and the (OE) radio illumination. Check that none of your new accessories were wired to this circuit. Then look for pinched wires, bad bulbs or sockets.

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63 Valiant Wagon
225 - 4 bbl