IH 3414 hot coil melted wires from + to points melted also

points of interest he ran a wire from bat to
a on off switch, from there to positive on coil.
he didnt run any wires from the #1 terminal at the alt.

one more thing, can i remove the ammeter
and replace it with a volt meter. how would this
affect wiring??

Leave the ammeter in place, and add a voltmeter, if that's what you think you need.

The voltmeter only requires a ground, and a source of battery voltage that is switched on and off by the ignition switch.

It's a "totally different animal" than an ameter, in that the charging current does NOT pass though the voltmeter on it's way to the battery, which is how an ammeter is set up. So, you CAN'T substitute one for the other without wiring changes.

Chances are the coil should have had a resistor or a resistance wire in series from the battery source, so without the resistance to limit the current in the coil windings to a safe value, the heat generated started to cook the insulation off the copper wires inside. The coil has layers of copper wire with thin insulation. If the wire gets too hot the insulation fails and the layers of wire all start to progressively short to each other and what you end up with is nearly a direct short from one coil terminal to the other. Then your battery is effectively connected almost directly to the points and when they close enough current flows to melt wires and get the points hot also. Lucky it didn't catch fire.