How do you wire an ignition coil to a distributor autotuffworks›Under the Hood›Other SystemsThe distributor is what gets that high voltage from the coil to the right cylinder. The connection is accomplished through a cap and rotor. The ignition coil connects to the rotor, and the rotor spins around inside the cap. The coil passes a high-voltage pulse through the rotor each time it passes.. How to Wire 12 Volt Coils | It Still Runs These coils had very simple wiring. They usually required only three wires: the spark plug wire, the power wire and the ignition switch wire. Ignition coils of this type are usually a little larger than a soda can and are heavy because of the metal core and the field coil windings.