Vehicle starters, spark plugs, and starting fluids control the flow of current through the electrical system. A starter in a vehicle helps the engine operate. It consists of a flywheel, pinion, motor, battery, and solenoid switch. Spark plugs have high-voltage electricity sent to one end and ignite a spark at the other end. The spark fires the air and fuel mixture within the engine and creates the combustion that powers the vehicle. Starting fluids help internal combustion engines operate properly and are used to start engines of older or poorly maintained vehicles in freezing temperatures.