How does a battery cable work?
Your car’s battery cables are the wires that connect the battery to the rest of the electrical system in your vehicle. There are two main cables: one that connects the positive terminal of the battery to the engine and electrical system, and the other that connects the negative terminal to the car's body or chassis.
These cables play a crucial role in getting power from the battery to start the engine and run things like the lights, radio, and other electrical components in your car. Without them, the battery wouldn't be able to send power to the rest of the vehicle.
Over time, the cables can wear out, become corroded, or even break, which can lead to electrical issues or prevent your car from starting.
What does a battery cable replacement job involve?
Replacing battery cables is a straightforward repair for most mechanics and can often be completed at your location, as long as it is safe to do so. In some cases, the mechanic might need to bring the car into a workshop to perform more detailed diagnostics.
The battery cable replacement process is as follows:
- To begin, the mechanic will lift or position the vehicle to access the battery and electrical system, ensuring they have a clear view of the components that need attention.
- Once that's done, the mechanic will carefully inspect the battery and its connected cables for any signs of wear, corrosion, or damage that could be affecting the system.
- If the cables are found to be damaged, the mechanic will replace them with new, durable battery cables, ensuring secure and efficient connections for the electrical system.
- At this stage, the mechanic will also check other related components, such as the battery itself and any electrical connections, providing advice on whether any additional parts need repairs or replacement.
- Before concluding the job, the mechanic will test both the starter motor and the alternator. The starter motor will be checked to ensure it operates correctly, while the alternator’s voltage output will be tested to confirm it's charging the battery properly and maintaining the vehicle's electrical system.
Replacing battery cables is a relatively simple task but requires precision to ensure your vehicle's electrical system is functioning correctly.
How do I know whether I need a battery cable repair or replacement?
Battery cable issues can cause a range of electrical problems in your vehicle. Here are some signs that may indicate the cables need attention:
Signs you may need a battery cable replacement:
- The car won’t start at all, despite a healthy battery.
- No power to electrical systems like lights, radio, or dashboard.
- Visible damage to the cables, such as fraying, cracks, or melted insulation.
- Heavy corrosion at the terminals or along the cable.
- Cables are brittle or have broken wires.
Signs you may need a battery cable repair (rather than full replacement):
- Slow or inconsistent engine starts.
- Minor corrosion at the terminals that can be cleaned.
- Loose or slightly corroded connectors that can be tightened or cleaned.
- Cable ends or terminals are damaged but the cable itself is intact.
Important note: It’s safer and more reliable to replace battery cables rather than repair them—especially if they’re severely corroded or damaged. Temporary repairs can help in emergencies, but a proper fix ensures consistent performance and avoids electrical risks.
What does a ClickMechanic battery cable replacement quote cover?
Unless otherwise stated, the quote for your battery to be replaced will cover;
- Cost of the battery cable
- Coming to you
- Installation of the new cable
- Disposal of the old parts (unless you request to keep them)
- VAT (if applicable)
- 12 months parts and labour warranty
Can a mobile mechanic replace the battery cable?
Yes, a battery cable replacement can be done by a mobile mechanic, as it is a fairly simple procedure. Utilising our mobile mechanics allows for a seamless and convenient experience, saving the time and money spent bringing your vehicle to a garage.
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Frequently asked questions about battery cable replacement & repairs
Read our answers to questions about battery cable replacement costs, symptoms and more.
What does a battery cable do?
The battery cables are used to connect the battery terminals to the electrical distribution point (+ve) and to the earthing point (-ve) on the vehicle's chassis.
What does a battery cable replacement involve?
- Mechanic checks the electrical and battery system.
- If necessary, the mechanic will replace the cable.
- Mechanic will advise if other components need to be replaced.
- Mechanic will test the starter motor.
- Mechanic will test the alternator voltage output.
Can you replace battery cables yourself?
Unless you are a qualified mechanic with the required skills, training and equipment to do the job, we strongly recommend a battery cable replacement is only carried out by a professional mechanic. ClickMechanic can help get you a vetted and local mechanic to carry out the work. Just enter your postcode and your car's registration number at the top of this page and select the work needed to get an instant fixed price up front.
What are the symptoms of faulty battery cables?
- When the car does not start.
- When none of the electrical equipment works
- When you notice the cable is corroded or damaged.
How long does it take to replace battery cables?
A battery cable replacement usually takes under 1 hour, but can take more time. Ultimately, the time that the job will take will depend on a number of factors, like your vehicle's make and model, year, as well as other factors. Select your car at the top of this page for information on job time and cost for your vehicle through ClickMechanic.
How often do battery cables need to be replaced?
Over time, the condition of the battery leads can deteriorate. Usually the battery leads corrode, especially at the connectors to the battery.
When the leads have corroded it will cause a bad connection in the electrical system. It is therefore important to replace the battery leads when they are damaged or corroded. When damaged the lead is unable to transfer the correct current to the other parts of the electrical system leading to numerous other issues.
When should you replace car battery cables?
Over time, the condition of the battery leads can deteriorate. Usually the battery leads corrode, especially at the connectors to the battery. In other cases it might be that cracks appear in the cable's plastic coating due to being exposed to the high temperature fluctuations in the engine bay.
When the leads have corroded it will cause a bad connection in the electrical system. It is therefore important to replace the battery leads when they are damaged or corroded. When damaged the lead is unable to transfer the correct current to the other parts of the electrical system leading to numerous other issues.
How much does a battery cable replacement cost?
Cost for a battery cable replacement depends on your location, car and what parts your car's manufacturer recommends using for the replacement. Find out what you could save with ClickMechanic by selecting your car at the top of this page!
Can you drive with a bad battery cables?
If one of the battery cables is bad then it is possible you will find that the car does not start, or it may be that none of the electrical equipment works. It is advisable to find assistance from a professional mechanic before you undertake a journey. A mechanic can diagnose the issue and provide an indication on any repairs required.
What happens if you switch battery cables?
It is very important to use the battery cables as per the vehicle manufacturer's recommended procedure. Using the cables incorrectly can permentantly damage components on the vehicle and can be a safety hazard.
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Mechanics that undertake battery cable work
- AI Mobile Vehicle Servicing, London
- EAST DEVON AUTOS, Ottery St.Mary
- ESM Autos Ltd, Worcester Park
- Jays Autos, Amersham
- Jwt Motorworks Ltd, Huyton
- Kilworth Garage Ltd, North Kilworth
- PROFLEET VAN AND TRUCK MAINTENANCE LTD, Dartford
- RSW AUTOCARE, Winscombe
- Rs Car Sales Limited, Crewe
- S.W MOTORS LTD, Taunton
- Spilsby Autocentre, Spilsbh
- TVS, Maidstone