Battery cables are the heavy-duty power lines of your vehicle. They are responsible for transferring massive amounts of electrical current from the battery to the starter motor to crank the engine, and to the alternator to keep the system charged while you drive.
These cables also feed the fuse block, which powers everything from your headlights to your radio. Because they are thick and carry high voltage, even a small amount of resistance—often caused by the white or bluish acidic corrosion common in the South African climate—can choke the power supply. If these cables are compromised, your car might have plenty of battery life but still refuse to start, leaving you stranded.
For a standard hatchback or sedan (e.g., VW Polo, Toyota Corolla), a battery cable service or terminal replacement typically costs between R650 and R1,200. For larger vehicles or those with complex trunk-mounted batteries (like many BMW or Mercedes-Benz models), the price can range from R1,500 to R3,500 due to the length of the cables and the labor required for access. These estimates include the call-out fee (if mobile), parts, and labor.
Faulty battery cables are often misdiagnosed as a "dead battery." Many South African drivers waste thousands of rands replacing a perfectly good battery when the real problem is a R200 cable terminal or a loose connection. Beyond the cost, poor cables put an immense strain on your alternator and starter motor, potentially causing them to burn out prematurely. Keeping these connections clean and tight is the simplest way to ensure your car starts every single time, regardless of the weather.
Corrosion is the battery cable’s worst enemy. If you open the hood of your car, you may find a white or bluish powdery substance (dried acid) on the battery and cables. This acidic substance will corrode the battery terminal ends and the battery cable. It is a good practice to have the battery and cables checked and cleaned at regular intervals (we recommend every other oil change). This will prevent the corrosion from building up and it will extend the life of the battery cables.