Taking the conductivity of the bare copper wire as the benchmark, the copper content of the bare copper wire is about 99.9%, the conductivity is 100%, and the conductivity is ≥58.58mΩ/mm2 at room temperature of 20°C; while in the copper-magnesium alloy wire Among them, the content of Mg is about 0.14%~0.26%, the conductivity of CuMg alloy wire is ≥44mΩ/mm2, and the conductivity is about 75%. In the copper-tin alloy wire, the content of Sn is about 0.25%~0.35%, the conductivity of the CuSN alloy wire is ≥42mΩ/mm2, and the conductivity is about 72%. Taking 0.35mm2 bare copper wire as an example, the wire resistance value is about 54.4Ω/km, and the resistance value of CuSn and CuMg alloy is about 170Ω/km. In the automobile wiring harness, because the loop length of a single signal wire generally does not More than 5m, the longest is from the luggage compartment through the instrument to the BCM or gateway, so even the 0.13mm2 alloy wire, the wire resistance is very small and will not affect the signal.