[JayChicago]

But of course don’t forget about the reversed polarity on your positive ground old car. The red positive jumper cable will go to your positive (ground) battery post. The black negative jumper cable goes to the starter.

Also don’t forget to turn-on the ignition switch. Ignition circuit will still be fed by the depleted 6 volt battery.

Also make sure the car is in neutral before sending power to the starter.