An ignition cable serves a crucial role in the operation of an internal combustion engine by transmitting high voltage electrical power to the spark plugs. This power is delivered at precise intervals to ignite the fuel-air mixture in the engine's combustion chamber. Spark plug wires then convey the spark from either the distributor or directly from the ignition cable to the spark plugs, where combustion is initiated.

The ignition cable functions as a conduit for electric current, carrying it from the alternator or battery to the point where it is utilized. In traditional setups, this current travels to the distributor, which then distributes it to individual spark plug wires. These wires connect to the spark plugs, enabling them to generate sparks that ignite the fuel mixture during each engine cycle.

Modern vehicles, especially those controlled by computer systems, often feature individual spark coils integrated within each spark plug wire. In such setups, a central distributor and single ignition coil are typically replaced by multiple coils controlled by the vehicle's computer. This advancement allows for more precise timing and control of ignition events, enhancing engine performance and efficiency.

In older car models, ignition cables typically ran from the ignition coil to the distributor, and then from the distributor to each individual spark plug wire. This sequential delivery of electrical current ensured that each spark plug received the necessary voltage to function effectively.

Overall, ignition cables play a critical role in ensuring the reliable ignition of fuel in internal combustion engines. Whether directing current to a distributor or directly to individual spark plugs, these cables are essential components in the efficient operation of combustion engines across various vehicle types and models.