Engine Coil Diagram

The secondary coil normally has hundreds of times more turns of wire than the primary coil.

Engine coil diagram. Be sure to isolate the coil from the equipment wiring harness as well as the engine s wiring harness. Many a technician is fooled into replacing a good coil because the coil grounding lead was shorting out against a piece of sheet metal. Combustion engines like the one in your lawn mower require a spark to ignite the fuel the engine needs for operation. This video concentrates on coils from an electronic point of view and reading wiring diagrams.

That s right unhook the ignition grounding lead from the coil itself and use the spark tester. Current flows from the battery through the primary winding of the coil. An ignition coil also called a spark coil is an induction coil in an automobile s ignition system that transforms the battery s low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel. One coil of wire is called the primary coil.

The coil is a simple device essentially a high voltage transformer made up of two coils of wire. Some coils have an internal resistor while others rely on a resistor wire or an external resistor to limit the current flowing into the coil from the car.