What does IGN stand for in cars?

[PresleyLee]

In automotive circuit diagrams, the IGN power supply refers to the power supply system controlled by the ignition switch, which means the power line that supplies electricity only after the engine is ignited. The vehicle's electrical system is basically composed of three parts: constant power (30 power), IGN (smart power), and ACC power supply. The electrical components connected to the IGN (smart power) are generally used only when the engine is running, drawing power from the generator. Common issues in automotive circuits include: Burned-out or dim bulbs: The thickness of the wires is designed based on the wattage and current of the electrical components. If the bulb's wattage increases while the wire remains the original harness, prolonged operation can cause the wires to heat up, harden, and increase current, leading to potential circuit issues, short circuits, or power failures. Circuit faults: These include poor contact, loose connections, moisture, corrosion, etc., which result in poor insulation and can cause short circuits, open circuits, or grounding issues.