Which wire is the tail light ground wire?

[McFrank]

The tail light ground wire is the black wire. What is the purpose of the tail light ground wire: The ground wire in a car is connected to the negative terminal of the battery, which is attached to the vehicle body. Therefore, the entire vehicle is essentially electrified. Electrical devices are mounted on the vehicle body, with one end connected to the positive terminal, while the negative terminal is conducted through the vehicle body. The ground wire (negative) is the point where it connects to the vehicle body. What does the ground wire mean: In a car, the ground wire refers to a current return line. The current flows from the positive terminal of the battery, passes through various switches and electrical actuators, and then returns to the negative terminal of the battery via a return wire, forming a circuit. This allows electrical devices to perform various functions and responses. Cars use a single-wire system, meaning most wires originate from the power source. The return wires for various electrical actuators do not directly connect to the negative terminal of the battery but instead indirectly return to the negative terminal through the vehicle's metal body. Any wire connected to the vehicle's metal body can generally be referred to as a ground wire.