Hotwiring's the process of bypassing an automobile's ignition interlock and thus starting it without the key. Method To know how to hot-wire a vehicle, it's important to understand how a vehicle's electrical system works. Instead of using a multimeter or test light, it's often easier to look up the information required. Remote start units will by definition need access to the same wires (and others besides), and there're internet databases with listings of wire colors and locations. Hotwiring g… (More on Hotwiring)