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.
Top Mechanics For Battery Cable Replacement & Repairs
111 Reviews
Garage in Harrogate, 17 years of experience
Deal with all car repairs and maintenance, based in Harrogate. Multiple years of experience.
ARRAN • 28th October 2025
Land Rover Discovery 4 • Additional work following previous booking
187 Reviews
Mobile mechanic in Birmingham, 12 years of experience
I began my career with my apprenticeship in Poland before coming to the UK. My first role in the UK was with 4 Cars in Yardley, Birmingham for 7 years before moving across to Whittaker Fleet Care for around ...
65 Reviews
Mobile mechanic in Telford, 11 years of experience
Our mobile mechanics save the hassle of driving your car to a garage. Book your mobile car service online and we'll come to your home or office.
27 Reviews
Garage in Wokingham Berkshire, 10 years of experience
I'm mechanic for more then 10 years experience i'm work in the past for two garages and from 2 years i have my own garage. I can fix your car for any issues like: Engine repair Gearbox repair ...
170 Reviews
Garage in Walsall, 15 years of experience
AA Approved Repairer RAC Accredited Repairer NHS Discount Up to 30 Years Experience throughout the whole company Air Conditioning Service/Re-Gas
DEAN • 20th November 2025
Ford Kuga • Timing belt replacement
484 Reviews
Mobile mechanic in Northamptonshire , 28 years of experience
With over 20 years of hands-on experience in the motor industry, I bring a wealth of knowledge and a passion for quality vehicle repair and diagnostics. I began my career with a Ford dealership, gaining a st...
30 Reviews
Garage in Wexham, 18 years of experience
I have been in the motor trade for 18 years. I have worked with multiple dealerships like Land Rover, Mercedes and BMW and have gained extensive experience over the years. I now work in a lovely garage on a ...
FERGUS • 20th November 2025
Renault Grand Scenic • MOT with collection & delivery
52 Reviews
Garage in Fareham, 15 years of experience
Mechanical skills for the last 15 years, working on cars, motorcycles and vans, i can cover anything from timing belts to clutches, servicing and arrange MOTS. I’m happy to help whatever it may be
125 Reviews
Garage in Halifax, 10 years of experience
10 years experience as a mechanic, competent in all aspects of vehicle maintenance and repair. STAR MOTORS cater for all makes/models & repairs but specialises in fast-fit work like Servicing, diagnostics...
MARK • 20th November 2025
Nissan Qashqai • Full Service
36 Reviews
Garage in Lincoln, 15 years of experience
specialising in HGV PMI's for trucks and trailers including roller brake tests, mechanical repairs on trucks and cars, computer diagnostics and a wide range of additional services
WILLIAM • 20th November 2025
Skoda Octavia • Timing chain replacement
110 Reviews
Garage in Abbots Road , 25 years of experience
Over 25 years experience in fixing cars,10 years of preparing rally cars. Studies: University and Master in auto vehicle engineering,all mechanical jobs done along my experience as clutches,timing belt,wet ...
16 Reviews
Garage in Bradford, 15 years of experience
15+ Years Of Experience In The Mechanical Trade | Qualified Apprentice Through City & Guilds | Qualified MOT Tester | Level 3 IMI/Diploma | Level 3 Award in MOT Test Centre Manager/AEDM. Reliable, energe...
MARK • 20th November 2025
Vauxhall Insignia • Brake discs and pads replacement - front (both)
Garage in St Leonards On Sea, 20 years of experience
We are a large restoration business which has been trading for 10 years comprising of colleagues across multiple disciplines We have a 5 ramp modern garage which is a Castrol accredited service centre and ...
LUKE • 20th November 2025
160 Reviews
Garage in Luton , 9 years of experience
Qualified mobile mechanic with 9 years of experience working on various makes and models of cars. Specialising in VW/Audi and BMW brands
ROSS • 20th November 2025
Ford Ranger • Fuel filter replacement
39 Reviews
Garage in Nuneaton, 20 years of experience
Commercial Breakdown (nationwide company) Vauxhall dealership BMW Dealership Independant Garages
HELEN • 20th November 2025
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.
Book a trusted mechanic today
Get an instant quote, then book a vetted mechanic to fix your car at your home or office.
- Vetted mechanics
- Save up to 50%
- Fast online booking
Mechanics that undertake battery cable work
- Ajrtransport Ltd, Sudbury
- Click Car Checks, Sheffield
- Cobham Tyres Ltd, Wimborne
- Constantin Nastasa, Gloucester
- D&N Autos Limited, Wythenshawe
- Db Motors, Ottery St. Mary
- Discount Tyres & Repair Centre Ltd, High Wycombe
- Friction Automotive, Grantham
- Kurbside, Eastbourne
- S N Vehicle Services, Biggleswade
- SJ Mobile Mechanic, Leeds
- Tech And Tyres, Melksham
- Wingrove Automotive Ltd, Wouldham
- XCEL Auto Services, Bristol