Automotive wiring and electrical repairs require specialist knowledge, the right equipment and genuine hands on expertise. At National Auto-Tec, we provide comprehensive wiring and electrical repair services across Melbourne — from complex harness diagnosis and repair through to full interior stripping for electrical access work. Our mobile service comes to your workshop, panel shop or location — no towing, no delays.

Wiring Harness Diagnosis & Repair Wiring harness faults are among the most complex and time consuming electrical problems to diagnose and repair. Whether caused by collision damage, rodent damage, heat degradation or manufacturing defects, a faulty harness can affect multiple vehicle systems simultaneously. We carry out comprehensive harness diagnosis and repair — restoring full electrical function across all affected systems.

Collision Harness Restoration Post-accident wiring harness damage requires specialist repair to restore correct electrical function before ADAS systems can be recalibrated and the vehicle returned to road. We carry out full post-accident harness restoration — documented for insurer requirements.

Junction Box Replacement & Coding Junction boxes and fuse boxes are frequently damaged in collisions or by water ingress. We supply, replace and code junction boxes across all major vehicle makes and models.

Earth Fault & Short Circuit Diagnosis & Repair Earth faults and short circuits can cause widespread and intermittent electrical faults throughout a vehicle. Our specialist diagnosis approach identifies the exact location and cause of earth faults and short circuits — rectifying them correctly without unnecessary parts replacement.

CAN Bus Wiring Diagnosis & Repair CAN bus wiring damage causes communication failures between modules — resulting in multiple warning lights and system faults. We diagnose and repair CAN bus wiring faults across all vehicle types including prestige and European vehicles.

Interior Stripping & Electrical Access Many electrical repairs require removal of interior trim components to access wiring, modules and harnesses. We carry out professional interior stripping and refitting — including dashboard removal, steering column removal, door card removal, seat removal and full interior strip for post-accident electrical repairs. All trim is removed and refitted to manufacturer standards with no damage to interior components.

Window & Sunroof Programming After glass replacement or body repairs, window regulators and sunroofs frequently require reprogramming and reinitialisation. We carry out all window and sunroof programming across all vehicle makes and models.

Custom Wiring Solutions Custom wiring harnesses, additional circuits and bespoke electrical solutions for modified vehicles, special purpose builds and fleet upfitting requirements.