Ford Model T Ignition Wiring Diagram No. 5 - Coil, Magneto & Commutator Wires

This document is a scanned wiring diagram labeled "Diagram No. 5 – Ignition Wiring," apparently from a period Ford Model T reference book. It illustrates the ignition circuit, showing how four numbered wires — No.1 Black, No.2 Red, No.3 Blue, and No.4 Green — run from the four vibrator coil units (numbered 1 through 4) through the wire loom to the commutator (timer) mounted on the engine. The same color code is repeated at both the coil box end and the commutator end of the loom, allowing correct matching of each coil to its corresponding commutator terminal. The diagram also depicts the magneto connection feeding the coil box, the ignition switch and horn switch on the switch panel, and a junction box with multiple terminals where circuits are joined. A component resembling the magneto/horn assembly is drawn at lower right of the switch wiring. Readers can learn the correct wire color assignments for the four ignition coils, the routing of the ignition wiring through the loom, and how the magneto, ignition switch, junction box, and commutator interconnect on this ignition system. The diagram is undated on the page itself; the uploader's filename suggests it covers 1919–1926 wiring.