Auto Electrical Service
Wiring Harness Repair
Expert fault tracing and loom repair for all vehicle makes.
Wiring harness faults are among the most challenging electrical problems in modern vehicles — intermittent, difficult to reproduce, and easy to misdiagnose. Themba specialises in systematic fault tracing using quality diagnostic equipment and factory wiring diagrams to find the actual cause, not just reset the codes.
Types of Wiring Faults We Fix
- Rodent (rat/mouse) chew damage — increasingly common in Johannesburg
- Insulation breakdown from heat or UV degradation
- Water ingress and connector corrosion
- Short circuits and open circuits
- Damage from previous amateur repairs
- Door, boot, and engine bay flex harness failures
Our Approach
Proper diagnosis before any repair. We use a multimeter, oscilloscope, and factory wiring diagrams to trace the fault to its source. Depending on the damage, we repair using correct-gauge wire and weatherproof connectors, or replace the affected harness section entirely.
Frequently Asked Questions
Multiple unrelated fault codes often point to a common cause — frequently a wiring fault, a failing battery, or a corroded earth connection. A systematic diagnostic approach will identify the root cause so you don't replace parts that aren't actually faulty.
Open your bonnet and look for chewed or exposed wires, especially near the battery and firewall. You may also see rodent droppings or nesting material. Electrical faults that appear suddenly and affect multiple systems are a strong indicator.
In most cases, yes. We identify and repair the specific sections that are damaged, using correct-gauge wire and proper waterproof splice connectors. Full loom replacement is only necessary when damage is extensive.
It depends on the complexity of the fault. Simple shorts or open circuits can be traced in 30–60 minutes. Intermittent faults on complex modern vehicles can take 2–4 hours. Themba will give you an honest assessment after the initial inspection.