Q: Alternators keep dying and killing batteries

asked by on November 06, 2015

The faulty alternator in my 2011 Jeep Wrangler wore out the last battery I had. I replaced both and that worked up until recently. The vehicle has about 172,000 miles on it at this point and I obviously need it to be reliable. The battery has been running low on power again so I think I have the same problem. Is there an alternator on the market that will stand up to my use?

Your alternator may be working fine and you just need to replace the dying battery. Most alternators tend to last a lot longer than most batteries.

The factory alternator on your Jeep is more than capable of handling your needs and there is no alternator claiming to last for extra long mileages. An alternator will last longer if the battery and cables are kept in good shape and the electrical load is not exceedingly high on a regular basis.

I suggest having a certified mechanic, such as one from YourMechanic, check out both the battery to properly diagnose the issue. If required they can also replace the alternator for you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Battery or alternator problems?

Hello, thanks for writing in. If the car runs fine once it is started, then the alternator should be fine. I would replace the battery because it is not holding a charge. Once it is replaced I would check the...

Car won't turn over, but battery is charged

From the symptoms described, it lead me to believe that your Ford Bronco may have a bad fuse. If the battery is known to be good and yet there is still no power to the vehicle, then it is likely...

Getting a p138b code - should I just replace the GPCM? I think a nearby lightning strike may be the culprit.

Hi there. If the codes for the engine are coming up with the glow plug control module failure, then check the module to see if there is any wiring burned or broken. If there is nothing wrong with the harness...

Related articles

How to Replace a Car Battery Temperature Sensor
The battery has a battery temperature sensor that can fail if the Check Engine Light comes on, the battery voltage is low, or the RPM curve surges.
Can a Car Battery Freeze?
Cold temperatures can make it hard to start your car, and extreme cold can freeze a battery. Use a battery heater to make your car reliable in winter.
All About Car Battery Chargers
Everyone Everyone has experienced a dead car battery from time to time. It’s common occurance, especially in winter, when batteries have to work even harder to get you to where you want to go. Fortunately, there’s a solution. A portable...