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About Contact 1800 BIG RIG
Auto Electrical

Chasing a fault? We find it fast

Electrical gremlins cost more in wasted hours than almost any other fault. Our auto electricians read the data, trace the wiring and fix the real cause — from a flat-every-morning battery to a dash full of warning lights.

Auto Electrical & Diagnostics

A modern truck is as much a computer network as it is a machine. Engine, transmission, brakes, emissions and body systems all talk to each other over data networks, monitored by dozens of sensors and controlled by multiple electronic modules. When something in that web goes wrong, the symptoms can be baffling — a warning light with no obvious cause, a system that derates for no apparent reason, intermittent faults that vanish the moment the truck reaches a workshop. Throwing parts at an electrical fault is the fastest way to spend money and fix nothing. Diagnosing it properly is a craft.

Our auto electricians combine old-school wiring know-how with modern diagnostic equipment. We read the fault codes and the live data, but we also understand what those codes actually mean and how to test the circuit behind them — because a code points you to the area, not the answer. We trace harnesses, check connectors and earths, test voltages and signals, and isolate the genuine cause whether it is a corroded earth, a chafed wire, a failing sensor or a tired module. Then we fix it once, properly, so it stays fixed.

Auto electrical work we handle

  • Fault-code scanning and live-data diagnosis across all systems
  • Charging and starting faults — alternators, starters, batteries
  • Wiring and harness repair, rewiring and connector renewal
  • Lighting, indicators and trailer-plug faults
  • Sensor and electronic module testing and replacement
  • Accessory fit-outs — beacons, reversing cameras, GPS, two-way and more

The flat-every-morning battery

Few things frustrate an operator more than a truck that is flat every morning or chews through batteries and alternators. These faults are almost always a parasitic drain, a charging problem or a wiring fault — and they are exactly the kind of issue that gets misdiagnosed as 'just a bad battery' over and over. We test the charging system under load, hunt down parasitic drains methodically, and find the actual reason your truck will not hold charge, so you stop buying batteries and start every shift with a turn of the key.

Fit-outs and accessories, wired to last

Need beacons, work lights, reversing cameras, GPS tracking, two-way radio or telematics fitted? We install accessories the right way — properly fused, properly earthed, neatly loomed and routed so they last and never become the source of the next mystery fault. A tidy, well-planned electrical fit-out is the difference between an accessory that works for years and one that causes problems the day after it is installed.

Stop chasing the same electrical gremlin around your fleet. Book a proper diagnosis and we'll find it, fix it and document it.

// FAQ

Auto Electrical & Diagnostics questions

Yes. We scan the fault codes, read the live data and test the circuits behind them to find the real cause, then fix it. Warning lights are a starting point for diagnosis, not the whole story.

That's almost always a parasitic drain, charging fault or wiring problem rather than the battery itself. We test the system under load and trace the actual cause so it stops happening.

Yes. We professionally install lighting, cameras, telematics, two-way and other accessories — properly fused, earthed and loomed so they're reliable and don't create new faults.

Get this booked in

Straight talk, fixed quotes and heavy-diesel work done to last. Book your truck in or call the 24/7 breakdown line.