Skip the auto shop - Our mechanics make house calls

Q: Car possibly destroying batteries

asked by on

Last week I noticed a strong sulfur smells coming from under my hood. Being that Im broke and have ZERO knowledge about cars I ignored it and kept my fingers crossed it would go away. The day after I noticed smoke. At the same time the battery light popped up on my dash. I popped the hood, was hit with a strong smell of sulfur, seen TONS of smoke coming off the battery, and seen liquid on and around the battery. I changed out the battery and the smoking and smell stopped. Now, less than a week later I can smell the sulfur again, am noticing a small amount of smoke, and hear a faint and steady high pitched hum/crackle coming from either the battery or fuse box. I really cannot tell which it's coming from. Could something within the fuse box cause an issue with the battery? If not, what else could cause the battery to be funky. The spark plugs have recently been replaced and a friend tested the alternator which was normal. Please help. Thanks!

My car has 190000 miles.
My car has an automatic transmission.

A: Hey there. This may be related to a bad gro...

Hey there. This may be related to a bad ground connection possibly causing a short or possibly a bad voltage regulator. This is a unit that regulates the charging of the battery by the alternator. Often times, this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery as in your case. In other cases, it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. If you would like to have this properly addressed, I recommend having a certified technician inspect the battery in person so they can figure out exactly what should be done.

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 use the Uconnect phone help command?

If you find yourself confused while using the Uconnect system, you can ask for help at any time. Simply press the Uconnect phone button (located on either the steering wheel or the center console), and say “Help.” Then follow the...

Q: Gas fumes smell

Hello there, thank you for asking about your 2008 Volkswagen Touareg. You need to call your nearest dealer to see if your vehicle is covered under a recall for the fuel line leakage problem. The recall number is 08V035000. Do...

Q: No power to most fuses , truck runs very rough

Hi. Fuses tend to break when there is too much power being flowed through them. However, since you have power running to the motor, this could indicate a problem with the fuse box itself or perhaps a main relay. Without...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...