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Battery Light

Hello, thank you for writing in. The battery light and brake light often illuminate together when your alternator has failed. You can verify this easily by scanning for diagnostic codes. These are codes that pertain to the warning lights, and...

You need to check to make sure the large power wire to the alternator is getting power. If it is not then you may have to check the wire from alternator to the battery fuse box for burned out wires...

If the Engine and Battery Light have come on, then you probably have two separate problems. The Battery Light may indicate that the system's voltage may have dropped too low, which may be indicative of even more problems, such as...

I would recommend having your alternator (https://www.yourmechanic.com/services/alternator-replacement) tested for proper function with a digital multimeter by a qualified technician. This test will determine if the alternator is charging the battery at the proper levels. If the alternator is not charging...

Hi. This could mean there is a short somewhere connected to your alternator. A mechanic can trace this issue along with any other issues along the way in order to diagnose the cause of your battery light (https://www.yourmechanic.com/services/battery-light-is-on-inspection).

This may be a sign of a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while...

Hello. If you continue to have a low voltage issue with the new alternator then there may be a circuit issue. Most of the time, if the alternator is good, it is the battery cables or there is an issue...

When the battery light comes on this indicates that the vehicle isn't receiving sufficient enough power from the alternator. A starting charge system test should be performed to ensure the proper battery voltage, check the proper starter operation, and make...

Hello, thank you for writing in. The charging system is controlled by the PCM (powertrain control module). The module receives input information to keep the electrical system operating, if the voltage goes below 9.0 volts the light will come on...

Hello. This may be caused by a faulty ground connection or potentially a bad voltage regulator. Try checking to be sure you have a good connection from the battery to the car's chassis (black negative battery cable from the battery...

Hello. The battery light turning on when the engine is running indicates that system voltage is low. Everything required to run the engine, and everything in the car, will drain the battery. Most likely, it is the alternator, but the...

The bearing or brushes in your alternator are likely going out. You could also have another issue in your belt drive system causing the noise and lack of charging. A visual inspection of the drive system, a stethoscope to listen...

Hello, thanks for writing in about your Jeep Patriot. The low voltage condition from the alternator not charging will cause the Totally Integrated Control Module (TIPM) to not work correctly. You should have the battery charged up completely and then...

Hello. We will be happy to assist you. To find the cause of your drain a parasitic draw test must be performed. A parasitic draw test is performed by disconnecting the negative terminal of the battery and hooking a multimeter...

If the battery light is still on, the chances are your battery might not have needed replacement. The battery light is simply an indicator for the whole charging system. A bad battery, bad connection, bad alternator, bad regulator, etc. are...

Hello! The Battery Light indicates that there is a failure in the charging system. This should be diagnosed and repaired sooner than later, as a failing charging system can leave you stranded. The charging system needs to be tested to...

Hi, this comes up often. Your car battery light being on is an indication that your engine is not getting enough energy. This could be because of a malfunctioning alternator or a battery going bad. I suggest having a certified...

Hi there. Sounds like you may have to step up the alternator amperage output, to compensate for the new and improved stereo system. The factory alternator output (https://www.yourmechanic.com/services/alternator-replacement) may not be enough to handle the additional load. It could be,...

There is probably a fault in the charging circuit and or the connections. The charging system output should be tested and if you are noticing this problem (the warning light) intermittently but it is nevertheless quite repetitive, it's possible to...

These sound like the symptoms of an alternator failure. The alternator can cause all sorts of weird electrical symptoms if it has gone bad. While the battery is responsible for starting the vehicle, the alternator's job is to charge the...