The image below is the ignition circuit diagram for the 1940-1948 Lincoln V-12 engine models. Here are the components included inside the ignition system: ignition switch, 6 volt battery, ammeter, resistor, and distributor and coil. Please note that the distributor and coil are placed together. Before performing further wiring work, please study to understand this wiring diagram better. Click on image to view it larger in a new tab.