Attach the red jumper cables first. Start by clamping one red cable to the positive side of the battery that wont start. Then attach the other red clamp to the positive side of the working battery. Next, clamp one black cable to the negative side of the working battery.

Do you wire positive to negative?

The source of electricity must have two terminals: a positive terminal and a negative terminal. The electrons will need to flow from the negative terminal to the positive terminal through a copper wire or some other conductor.