Browse

Antiques Collectibles Apparel Baby Kids Items Books， Movies And Music Electronics Free Stuff Garden Outdoor Health Beauty Home Goods Home Improvement Supplies Musical Instruments Office Supplies Pet Supplies Sporting Goods Ticket Toys Games Transportation Others

Used Cars New Cars Others

Business Crafts Design And Web Events Home Improvement Legal Lessons Personal Pets Photography Repair And Technical Support Wellness Writing， Translation， And Transcription Others

Activities & Groups Artists & Musicians Classes & Lessons Events Friendship & Networking Lost & Found Rideshare Sports Teams Volunteers Travel & Travel Partners Skills & Language Swap Other

What are the reasons for the car battery warning light to come on?

2 Answers

DiValerie

07/24/25 3:28am

There are several reasons why the car battery warning light may come on: 1. Battery depletion - cars left unused for long periods may experience battery depletion, causing the warning light to illuminate; 2. Severe sulfation - after prolonged use, sulfate salts naturally accumulate on the battery plates, affecting normal battery operation; 3. The generator's output voltage is lower than the battery voltage, the generator is not working, or there is a fault in the power supply circuit. Battery maintenance tips: 1. Avoid parking the car in open parking lots for extended periods. If long-term parking is necessary, remove the battery to prevent freezing damage; 2. Charge the car battery regularly. A battery left unused for too long will gradually self-discharge until it becomes unusable, so start the car periodically to charge the battery; 3. Clean the battery terminals periodically and apply special grease to protect the wiring harness.

Was this review help?

3

2

Share

McAmara

08/10/25 11:04pm

The battery warning light is on, usually due to an issue with the charging system. When I encountered this myself, my first thought was that the alternator belt might be loose or broken, preventing the alternator from charging the battery properly. Or the battery itself might have reached its lifespan after five or six years and can no longer hold a charge. Corroded or oxidized terminals causing poor connections are also common. A blown fuse is another possibility, as it melts to protect the circuit from excessive current. A faulty voltage regulator can cause overcharging or undercharging. The most annoying among these is a false alarm where the light comes on for no real issue. I remember once driving on the highway when the light came on and the car started shaking—I immediately pulled over with hazard lights on, and later found out it was due to aging wiring. My advice is not to ignore the light when it comes on—safety first. Get out and check the battery voltage or ask for help. For routine maintenance, regularly clean the battery terminals and check the alternator belt tension before replacing the battery to prevent issues in advance.

Was this review help?

17

5

Share

Expand All

More Forum Discussions

Where is the trunk switch of the Qoros 3 located?

When the Qoros 3 is started, only the interior button can open the trunk. When the engine is off, the trunk can only be opened with the car key, and it cannot be opened from the outside. Press and hold the key for three seconds, or press and hold the switch in the middle of the cabin reading light for three seconds to open it. Below is an introduction to the Qoros 3: 1. Exterior: The new Qoros 3 retains the design and styling of the current model. The Qoros 3 five-door version and the Qoros 3 urban SUV have added a Volcano Orange exterior color option, while some models feature new Saddle Brown leather interiors. 2. The new car offers a sporty interior option with Lava Black and red stitching. The dimensions of the 2018 Qoros 3 are 4627/1839/1445mm (length/width/height), with a wheelbase of 2702mm, representing an increase of 12mm in both body length and wheelbase compared to the current model. 3. The series has added an engine idle start-stop system and more interior color options. Additionally, the new car comes standard with LED daytime running lights, LED light guide rail combination taillights, and a "Follow me home" function.

What does the P button in a car mean?

The P button in the center of the car is the electronic parking brake. Its working principle is the same as that of the mechanical handbrake, both of which achieve parking brake control through the friction generated between the brake disc and the brake pads. The only difference is that the control method has changed from the previous mechanical handbrake lever to an electronic button. Information about the electronic parking brake is as follows: 1. The electronic parking brake is the electronic parking brake system: It integrates the temporary braking function during driving and the long-term braking function after parking, and realizes the parking brake technology through electronic control. 2. The electronic parking brake extends from the basic parking function to the automatic parking function AUTOHOLD: The application of the AUTOHOLD automatic parking function technology allows the driver to avoid long-term braking when the vehicle stops. When the automatic electronic parking brake is activated, unnecessary sliding of the vehicle can be avoided.

How Loud is the Fista?

The Fista has a noise level of 39.4 decibels at idle; when the speed reaches 60km/h, the noise is 61.7 decibels; at 80km/h, the noise is 64.2 decibels; and at 120km/h, the noise is 68.6 decibels. Here are the specific details: 1. The Fista uses Nexen tires with a specification of 225/45R17, which perform poorly in noise reduction. While driving, the sound from the connection between the tires and the road surface is transmitted into the car, especially at high speeds. The Fista's tire noise performance is significantly worse compared to other cars in the same class. Additionally, because the Fista has excellent acceleration performance, the engine noise is also relatively loud, leading to poor test results in engine noise. 2. If you want to reduce the interior noise, you can consider changing the tires. There are tires specifically designed for noise reduction, although they tend to be more expensive. 3. Furthermore, the internal structure of the engine may age over prolonged use, and incorrect tire pressure can also lead to increased interior noise.

What Causes Car Shaking During Startup?

Reasons for car shaking during startup: 1. Excessive carbon deposits: Severe carbon buildup in the engine cylinders can lead to clogged spark plugs and blocked valves, directly causing shaking during idle; 2. Fuel supply system malfunction: Unstable fuel pressure can cause inconsistent mixture concentration, resulting not only in shaking but also unstable idle; 3. Worn engine mounts: This is a very common cause of shaking. If the engine shaking worsens over time without a corresponding loss of power, the issue might be with the engine mounts; 4. Misfiring cylinders: The problem lies with the engine's ignition coils or spark plugs. If the ignition coils fail or the spark plugs cannot fire for some reason, the car will experience shaking.

What Do the Numbers on Engine Oil Mean?

Automotive engine oil labeling uses the viscosity classification method established by the Society of Automotive Engineers (SAE). This is a viscosity grading system that divides lubricants into high-temperature types for summer use, low-temperature types for winter use, and all-season types suitable for both winter and summer. The specific meanings are as follows: 1. Winter oil grades are: 0W, 5W, 10W, 15W, 20W, 25W. The symbol W stands for Winter, and the smaller the number before W, the lower the low-temperature viscosity, the better the low-temperature fluidity, and the lower the applicable minimum temperature. 2. Summer oil grades are: 20, 30, 40, 50. The larger the number, the higher the viscosity and the higher the applicable maximum temperature. 3. All-season oil grades are: 5W/20, 5W/30, 5W/40, 5W/50, 10W/20, 10W/30, 10W/40, 10W/50, 15W/20, 15W/30, 15W/40, 15W/50, 20W/20, 20W/30, 20W/40, 20W/50. The smaller the number representing the winter part, and the larger the number representing the summer part, the higher the viscosity and the wider the applicable temperature range.

What is the 4th gear in a car?

Car 4th gear is a relatively fast gear, corresponding to a speed range of 40-60km/h. The following introduces the matching speed for each gear and the timing for upshifting: Matching speed for each gear: First gear is for starting, with a speed generally between 0-5km/h. Second gear corresponds to 5-20km/h, third gear to 20-40km/h, fourth gear to 40-60km/h, and fifth gear to 60-100km/h. The 6th gear is for speeds between 100 to 120 kilometers per hour. Timing for upshifting: When the engine has ample power, it emits a dull "humming" sound. After upshifting, if there is no power deficiency or shaking of the transmission mechanism, and the speed increases quickly with the vehicle running very smoothly and naturally, it indicates the upshifting timing is accurate.

Trending Ranking

What is the Nissan TIIDA?

How to Determine When Car Tires Need Replacement?

Can You Still Drive with Damaged Spark Plugs?

What brand is the audio system in Lexus?

When to Use the S Gear in the Avancier?

What Causes Severe Vibration When the Air Conditioner is Turned On?

Do I have to replace the tire if it gets punctured by a nail?

How to Use Cruise Control Function?

What is the top speed of the 2012 Skoda Fabia?

What are the causes of glass breakage?

More Forum Discussions

How to Refurbish Car Headlights?

How to Remove the ETC Device?

What maintenance is needed for a sedan at 10,000 kilometers?

Which generation is the aq250 transmission?

Help

Cookie

Cookie Settings

© 2025 Servanan International Pte. Ltd.