For example, in a 12 V circuit, the maximum voltage drop cannot exceed 0.36 V, and the remaining 97% of the voltage (11.64 V) should be available for electrical loads. Since the wires used in the automobile wiring harness directly have the inevitability of the connection of multiple wires, with the help of different tooling equipment and process methods, the voltage drop caused by the wire factor can be minimized. Usually, less than 3mV is a qualified voltage drop.
In the manufacturing process of automobile wiring harness, U-shaped terminal punching connection is generally used for wires that need to be connected by wire, ultrasonic welding machine is used to weld wire contacts, and process methods such as terminal double-wire and multi-wire common voltage connection are used.