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This multi-part blog series breaks down a vehicle’s electrical system into easy-to-understand chunks. Part 1 was an overview of the basic principles of auto electrical systems. In Part 2, we will discuss the 3 main auto electrical systems and circuits, including the ignition & starter, auto lights, and auxiliary systems. We will cover how these components work, troubleshoot common issues, and discuss repairs & maintenance.     How Auto Electrical Systems Work It may seem like magic, but all your car’s cool features actually work through a complicated wiring network. A vehicle wiring harness is the main body of an auto electrical system. It is a group of wires designed to safely and efficiently deliver electricity from the car battery to devices throughout the entire automobile.  How Auto Electrical Circuits Work Every electric-powered component in your vehicle works because of an electrical circuit. Electrical circuits are circular routes that electrical currents (aka electrons) flow through. The electrical current / electrons originates from the power source (+ battery terminal) and moves through the fuse. Next, the current flows to the switch and into the load device, like your headlights. Then, the current goes through a ground wire secured to the vehicle’s frame. Finally, the current completes its loop back to the power source (- battery terminal). 3...