Msd 6a wiring help

So here is my situation. For my 1969 dart I bought a new msd Iginiton, coil and distributor from summit. Wired it up, hooked small red wire to all wires (3) on ballast resistor on drivers side firewall. Started car and melted wire going to what I believe is the voltage regulator small box on driver side firewall just below washed hose grommet.

1. What’s the correct wiring for the small red wire?
2. What do you do with the voltage regulator and it’s wire?
3. Why did that wire melt? Could I have fried anything else of importance?