Ignition switch wiring color codes provide a practical way to identify electrical circuits responsible for starting the engine, powering accessories, and supplying ignition voltage. Because wire colors vary among manufacturers and model years, accurate identification is essential for safe diagnosis, repair, or replacement.
A wiring diagram, a multimeter, and careful attention to terminal labels can help prevent short circuits and damage to sensitive ignition-system components. Understanding these codes also clarifies how the battery, starter, ignition, and accessory circuits work together.
Ignition switch wiring color codes identify the circuits controlled by the switch, such as battery power, accessory power, ignition power, and the starter signal. These colors are not universal across vehicle manufacturers.
Common conventions include red for constant battery power, yellow for starter control, and pink or orange for ignition-operated circuits. Accessory wires may be brown, orange, or another manufacturer-specific color.
Because wiring standards vary by make, model, year, and region, color alone should never determine a connection. Factory wiring diagrams and connector pin assignments provide more reliable identification.
Before testing, disconnect the battery when removing the switch, then use a multimeter to verify voltage and continuity. Incorrect connections can damage control modules, create short circuits, or cause unintended engine cranking.