Skip the auto shop - Our mechanics make house calls

Q: My negative battery cable start smoking when the car is running.

asked by on

My negative battery cable is smoking and is hot on the battery terminal when the car is running.I just put a new battery in last week but noticed a burning smell from the engine today. There is no engine light on battery light not on the car is running but the negative battery cable is smoking and hot.please help

My car has 118000 miles.
My car has an automatic transmission.

There is a faulty, high resistance (often due to corrosion, wire defect or break or loose mechanical connection) connection at the battery post and/or at the vehicle ground(s) at the frame. The recommended and safest practice is to replace the cable (cables can corrode within and cable crimps at the cable ends can’t be serviced without shortening the cable). When replacing, particular attention should be paid to the cleanliness and quality of the vehicle ground connection. This is a safety issue and consequently the repair is recommended at your earliest convenience. If you desire mobile service on this repair, the service to request is battery cable replacement and the responding certified mechanic will deal with it promptly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I adjust the collision warning Warning Light?

The collision warning system is an important safety feature that lets you know when your vehicle is in danger of a collision. The collision warning system alerts you with both a chime and a warning light, but the warning light...

Q: Turning wheel left and right clunk noise possibly a strut mount?

Hi there. In most cases, a clunking sound when turning the steering wheel is typically an indication of a damaged steering stabilizer bar bushing. However, it can also be a damaged strut mount, tie rod or CV joint that is...

Q: What hose do I need to buy (the one that sits next to the water pump above the alternator)?

Hi - rather than just "throw parts at it," it is a better investment to determine the real problem, and only buy the parts you need. I would recommend having your oil and fluids inspected by a professional mechanic, such...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.