[SonicRaT]

Is the vehicle still 6V, positive ground? Where exactly do you have the ignition switch wired into the distributor? It should either be wired to the brass tongue as you called it on the base plate with the wire coming from the base plate going to the terminal on the points or it can be wired directly to the points terminal on the upper plate.

I would verify that your ignition wiring is not shorting in the distributor anywhere and is in one of the correct locations.

After that, check the negative side of the coil by connecting the negative lead of your volt meter to the negative terminal of the coil, positive lead to a ground and confirming voltage is present.

From this point on, switch your volt meter to continuity and move one lead to the positive coil terminal. Then use the other meter lead to check that you have continuity to the wire coming off of the ignition switch where it connects to the distributor, wether that is the base plate "tongue" or the points terminal on the upper plate. If that looks OK, then I would check continuity at the points themselves.

At the points, if they are closed, you should be able to follow continuity all the way to the ground of the plate and the vehicle. If you get it reading continuity this far, leave the meter setup and then manually open the points with something non-conductive and you should see a break in continuity. If you see this break, then that confirms all of the wiring is correct and from there all you would need to do is set the appropriate points gap.

The safety fuse installs in-line on the yellow wire that goes from the passenger side of the terminal block to the starter post. You can verify this is correct and working by checking with a voltmeter that you have 6V when connecting to the passenger side of the terminal block with the negative lead of a volt meter and connecting the positive side to a chassis ground.

For your horn and headlights, those are fed by a yellow/black wire that begins at the drivers side of the terminal block, which then runs along the drivers side of the engine, over the coolant outlet and oil filler/breather tube and finally to the generator cut-out. At the cut-out, it should be bolted to a terminal along with two other wires -- those two other wires run to the horn and the headlight switch.