LongTripComfort
2026-07-15
The service life of automotive wiring harnesses is typically around 10 years, though the exact duration depends on factors such as operating environment, maintenance conditions, and electrical load. Signs of wiring harness aging primarily include cracking, hardening, or peeling of the insulation layer; loose connectors leading to poor contact; and accelerated degradation in high-temperature areas (e.g., near the engine). For instance, an AVSS-type PVC-insulated wire rated for 80°C, with a 0.5mm² cross-sectional area, can sustain a 12A current in a 30°C environment. Under these conditions, a 50°C temperature rise yields a design life of 10 years (equivalent to approximately 10,000 cumulative operating hours). Notably, electric vehicles exhibit slower wiring harness aging compared to conventional fuel-powered vehicles, owing to shorter harness lengths (typically under 1.5 kilometres) and the absence of engine vibration. Owners of older vehicles are advised to schedule professional wiring harness inspections every 5 years, with particular attention to harness conditions in the engine bay. Additionally, avoiding circuit modifications that may cause overload can significantly prolong harness service life.
