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
120 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 ...
6 Reviews
Mobile mechanic in Gwynedd, 15 years of experience
At OJS Recovery, we strive to provide exceptional service to all of our customers. Our team are dedicated to getting you back on the road as quickly as possible
JAMESON • 21st February 2026
Renault Master • Standard Pre-purchase Inspection
102 Reviews
Mobile mechanic in London, 12 years of experience
Extensive history in the automotive industry. Specialising in; • programming, coding (ecu/bcm/pcm & more). • ecu tuning - engine protection as well as economical tuning for petrol & diesel cars used for ...
186 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.
ANDREW • 21st February 2026
Kia Sportage • Brake discs and pads replacement - front (both)
49 Reviews
Garage in Maldon, 12 years of experience
ECUlogic Solutions ECUlogic Solutions is a specialist automotive diagnostics and repair company delivering expert services across the automotive sector. With over 20 years’ industry experience, we provide...
PARIS • 21st February 2026
Ford EcoSport • Brake pads replacement - front (all)
32 Reviews
Garage in Ludgershall, 24 years of experience
We are a small but highly equipped and experienced garage on the outskirts of Andover, offering everything from diagnostics and general repairs through to electronic modifications and remapping. We stand on ...
47 Reviews
Garage in Portsmouth , 16 years of experience
10 years vag specialist 6 years garage owner all makes and models servicing and mot (arranged) specialist in cambelts wetbelts diagnostic electrical faults clutches
TERRY • 21st February 2026
Volkswagen Passat • Timing belt replacement
541 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...
JASMIN • 21st February 2026
Nissan Qashqai • Additional work following previous booking
24 Reviews
Garage in Liverpool , 10 years of experience
Combining technical know-how with a personal touch, ST Garage delivers trusted and efficient service, ensuring vehicles are repaired and maintained to the highest standards.Based in Liverpool, ST Garage has ...
921 Reviews
Mobile mechanic in Braintree, 15 years of experience
At WrenchWorks Automotive, we’re driven by a simple mission to take the stress out of car problems by bringing trusted, professional vehicle services directly to you. As accredited members of The Motor Om...
NICUSOR • 21st February 2026
198 Reviews
Garage in Bletchley, Milton Keynes, 16 years of experience
Been working in garages for 16 years. The last year been doing mobile mechanics. I love taking on new challenges and getting stuck in. I offer a wide range of repairs including diagnostics, servicing, brake...
SUSAN • 21st February 2026
Kia Sportage • Brake pads replacement - front (all)
2 Reviews
Garage in Shropshire , 10 years of experience
★Js Automotive★offers professional vehicle servicing, diagnostics, and repair services for cars and light commercial vehicles. ●Engineering Course (School) – Completed extended engineering course 1 year aft...
133 Reviews
Garage in London, 15 years of experience
Max Valeting and Maintenance (JMaxx Autocare) provides comprehensive automotive services, including MOT testing, vehicle servicing, tyres, air conditioning and repairs. Our skilled team is dedicated to ensur...
594 Reviews
Garage in London, 15 years of experience
I have been interested in the car repair industry for almost my entire life. The first few years were spent learning the trade and I went to college to study it properly. I worked at a garage as a BMW specia...
RICHARD • 21st February 2026
Volvo C30 • Additional work following previous booking
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
- ACE AUTOS ALVA LTD, Alva,Clackmannanshire
- AW AUTO LOGISTICS, Stafford
- BISB AUTOMOTIVE LIMITED, Dunstable
- Bk Auto Services, Worthing
- C.a.r.s. Auto Services, Tadley
- Carma Autocare, St Leonards On Sea
- Jjo Mechanics, Stoke-On-Trent
- M & O Motors, Newton Abbot
- Mark Dawson, Manchester
- Rays Auto Services Mobile Mechanic, Alton
- Sak Performance Ltd, Woking
- Spanner Monkeys NE Limited, Newcastle Upon Tyne