How to Diagnose and Fix Car Battery Not Charging Problems?

A car battery is an essential component of the car that is used to start the car engine. Apart from the usefulness that it provides, the car battery can fail to function because of different reasons such as wrong connection, damage in the storm and many others.  The charging problem of car batteries is common and is supposed to be fixed immediately, especially when there is a vacation that you need to go with your car.

As long as you have the required tools and follow the proper steps, it is so easy to fix the charging problem of the car battery. However, the fixing process may also be a bit difficult for some people. Luckily enough, this article shows how you can use it to identify a car battery that has charging problems and ways that you can use it to fix the problem.

How to identify car battery not charging problem and how to troubleshoot such problem

There are times when the car battery will fail to charge. The situation is so depressing, especially when the owner is in the middle of the journey and is not aware of how to fix the problem. Different conditions or things can cause the charging failure of the car batteries. Below are some of them and how to troubleshoot the problem.

1. Bad chargercar battery not charging

It is essential to check the condition of the car battery charger. Sometimes, the car battery charger may become loose or completely blown out and fail to transmit energy from the power supply source to the battery. Again, the car battery charger may fail to hold the required amount of charge to charge the battery completely. Below are the steps that you can follow to fix a faulty charger problem.  

You need to test the battery with another charger to ensure that the problem is the charger. If the other charger charges the battery, it shows that the original battery charger is faulty and needs to be fixed or replaced. Check the charger and find any problems. The issues may be a loose connection, faulty cable etc.

  • If the charger cable is loose, use a wire stripper and a wrench to tighten the wires.  Avoid over-tightening them to prevent breaking the wires.
  • If the charger wires are blown out, consider replacing them with new ones.
  • If the issue is with the charger fuse, consider replacing it with a new fuse recommended by the manufacturer or a professional mechanic.
  • If the whole charger is the fault, but one that suits the battery and the car model and is of high quality to last longer.

2. Bad car batteryBad car battery

When the battery fails to charge, the problem might be that the battery is faulty or is completely dead. When the car battery is left to sit idle for a long time, it starts to discharge slowly, and it may die altogether. However, before replacing the battery, check the car battery’s condition and by following the following steps. Battery’s state before considering replacing it.

  • Inspect the car and test the car battery using a digital voltmeter. The voltage of a typical car battery must be 12.5 and above, but if the voltage is low, the battery is not in good condition and thus requires immediate fixation before proceeding to the next step.
  • First, test the car battery by turning on the car’s headlights. If the car headlights light brightly, the car battery is in good condition, but the starter and the connection may be faulty. If the car headlights light dim, consider using other methods of checking the car battery status.

After checking the condition of the car battery and diagnosing the leading cause of the car battery not charging, follow the steps below to fix the problem

  1. First, locate the position of the car battery, and it is at the front panel near the car engine.
  2. Check the condition of the car battery and identify any problems.
  3. If the car battery is dead, jump-start the car with another battery that suits the car model.
  4.  Also, consider replacing the battery if it is wholly damaged but if you cannot carry out the activity on your own, consider seeking help from a nearby repair shop.
  5. If the problems persist, proceed to the next step of inspecting the car battery components.

3. The car alternator is damagedThe car alternator is damaged

A car alternator is an essential component that recharges the car battery. When the car’s alternator is terrible, it means that the battery charge is not renewed, and therefore the car won’t start. If the car battery fails to charge after troubleshooting a faulty battery and a faulty charger, test the car alternator to see if it is functioning normally. The following are the steps that you are supposed to follow to test the functioning of the alternator. One needs a multimeter to complete the process.

  •   Turn off the car engine.
  •   Switch the multimeter on and set it to direct current voltage.
  •   Connect the multimeter to the car battery, ensuring that the positive battery terminal matches the multimeter’s positive terminal and the negative terminals.
  •   Record the voltage that you obtain. The reading must be 12.3 volts.
  •   Repeat the process after turning on the car engine. The readings must be around 13 to 15 volts.
  •   Turn on all the car accessories and record the readings of the multimeter. The car accessories include; car headlights, radio, etc.
  •   Repeat the process to ensure the readings are correct and do not change with continuous testing.
  •   If the readings keep changing, the car alternator is faulty and requires immediate troubleshooting.

If the car alternator is damaged, scrutinize it to detect any issues and troubleshoot them using the methods below.

  • If the alternator fuse is wrong, use the correct alternator that suits the car and the battery model.
  • Check the alternator wiring. Tighten the loose wire connections using the correct tool. If the terminals have accumulated a lot of rust, clean them using recommended materials to prevent the terminals from eroding with the material used.
  • Check the alternator belt tension. Fault alternator slows the alternator rotation speed, thus affecting the car battery charging system. The best way of troubleshooting such a problem is by replacing the belt with a new one that suits the alternator.

You might be interested to read also: How To Reconnect A Car Battery?

4. A blown battery fuse

A blown battery fuse

A battery fuse is an essential component in the car that regulates the power supply to the car battery protecting the vehicle from an electrical surge that can blow the charger, cable and other car accessories. Most cars have an interior fuse and a second fuse. Fuse is essential in every vehicle. Follow the following steps to fix such a problem.

  • Find the location of the car battery fuse.
  • Scrutinize the fuse and identify any faults.
  • Measure the voltage of the fuse and ensure you measure both pins to get accurate results. The voltage must read 12 volts on each fuse pin.
  • If the fuse is blown out, consider replacing it with a new one that suits the battery. Ensure you buy a high-quality fuse that will last longer without any problems.

5. Fault starter

A faulty car starter drains energy from the car battery resulting in the battery discharging instead of charging. Continuous draining of the car battery affects its condition, damaging it further. To fix a car starter, first, check the state of the starter and consider replacing the whole car starter with a new one that suits the car type.


When you do not know how to fix the charging problems in the car batteries, the problem can be so much stress. If you find that your battery is no longer taking any charge, it is essential to look for the root cause of the problem and use the discussed methods to troubleshoot it. 

Again, when the car battery is not in use for a long time, it is supposed to be disconnected from the car and placed in a well dry place to prevent it from discharging. Finally, ensure you do regular servicing of the vehicle to ensure that the battery’s lifespan is extended.

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