1972 dart - stopped running while at 50 mph ? no warning

first go was wrong terminal , went to the negative on coil by mistake , instantly melted . second try hot wired to positive terminal for about ten seconds . turned the key , but nothing happened . no crank . using small wires though

You still need to have your battery cables hooked up to the battery from the car so you can crank it over with the key.

Hopefully your starter relay, and neutral safety switch are working correctly providing power to the starter when you hit the key.