Tracker Boat Wiring Schematic | Free Wiring Diagram Jan 18, 2021Variety of tracker boat wiring schematic. A wiring diagram is a simplified standard pictorial depiction of an electrical circuit. It shows the parts of the circuit as streamlined shapes, and the power and signal connections in between the devices. Electronic Fuel Injection Systems for Heavy-Duty Engines The STC version of the PT system was introduced in the 1980s and used for years with Cummins L10, M11, NT, N14 and K series engines in a variety of applications. In the late 1970s, the Bendix Corporation developed a closed nozzle fuel injection system using engine-driven unit injectors that allowed injection timing to be varied.