Q: Mercury Mariner battery light

asked by on January 26, 2017

Hey, Peter. I own a 2009 Mercury Mariner. Upon start up, the battery light came on 30 seconds later. It was intermittent 3 days ago. Now it's steady. I took it to Autozone and the battery charge was at 74%. I had replaced the battery 4 weeks ago after a few hard cold weather starts. I had heard it may be the voltage regulator part of the alternator. Can recharging the battery be a short term fix? I've been making daily trips of about 10 miles and back for a training class with no radio, heater blower or other equipment. The headlights do pulse some, but still starts up ok. I'm in Cincinnati. Can I make it home to Columbus with a recharged battery and get the proper fix at a sooner than later time, of course. It's about 140 miles away. Thanks for the assistance.

My car has 124000 miles.
My car has an automatic transmission.

One hundred forty miles is too far if your alternator has failed, even if you depart with a fully charged battery. In your circumstance, what you want to determine is charging output at the battery posts. Charging output should be around 14.5 volts but the exact value will be stated in your Factory Service Manual. Of course, be sure the problem is not just simply bad terminal connections at the battery thus preventing the charging circuit from being completed. Your battery should also be load tested. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an alternator inspection/diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help 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

Car clicking and not starting

Low voltage is one of the main causes for a starter solenoid to click continuously without turning the engine over. An electromagnet pulls the contacts together in the solenoid. As soon as contact is made and the starter motor is...

What parts are needed to replace rear struts? I have the strut and spring assembly and the boot mount replacement 1999 Lexus RX300

Hi there - you have the parts you need for strut replacement. For assistance, I recommend a strut replacement service performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem,...

is it safe to keep driving my car with a blown ac compressor

Hi! It is most likely OK to operate your vehicle even thought the a/c compressor has failed. However there are a couple things to be aware of. As long as the compressor pulley is rotating smoothly, without wobble or noise,...

Related articles

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.
The Do's and Don'ts of Jumpstarting a Car
Knowing how to jumpstart a car is a skill all drivers should have. Always ground the circuit and connect the jumper cables to the proper terminals.
How Long Do Battery Terminal Ends Last?
A A properly working charging system is an essential part of keeping a car reliable. Each of the components of a charging system has a specific job that it must perform in order for the vehicle to run properly. In...