The Car Battery Keeps Dying, but the Alternator Is Good

Car batteries can die due to a different range of reasons. There is a possibility that whatever made the battery die will not repeatedly happen after solving the problem. However, when the battery keeps breaking most of the time, it shows an underlying problem that needs to be solved before it gets worse.

When the battery has some problems, the first thing we predict might be wrong is the alternator. In our case, the battery keeps dying, but the alternator is good. In this article, we discuss the same issue, why it happens, and how to correct that problem.

The car battery keeps dying, but the alternator is good

Sometimes you may be asking yourself why the car battery keeps dying while the alternator is in good condition. What might be happening to the battery causing it to behave in such a way? Below are some of the reasons why the battery behaves so when the alternator is in good condition.

1. The battery is unable to retain the charge because of a flawed charging systemcar battery keeps dying but alternator is good

The battery is responsible for providing current for starting the car and operation of the other electrical systems in the vehicle. The metals inside the battery may be oxidized and corrupted due to the old age of the battery. This corroding may cause the battery not to charge even if your alternator is good. Therefore, the charge level of the battery drops so that it can’t start the car.

Again, the charging system may also get damaged when there is a loose connection of the cables or when the terminal wires are corroded. The lousy link does not matter whether it is the positive terminal cable affected or the cable in the negative terminal.

2. There is no time given to the alternator to rechargeThere is no time given to the alternator to recharge

The purpose of the alternator is to recharge the battery, and the battery provides power for the startup of the car. When you frequently start and stop the vehicle, a lot of energy is drawn from the car battery that the alternator cannot recharge the battery fully. As a result, the battery will keep on dying because there is not enough power to be used.

Signs of a failed charging systemSigns of a failed charging system

Knowing when the system is flawed or failing is essential since it helps protect their battery not to die. The following are some of the signs to show that the charging system is failing.

  • The battery will always appear to be undercharged.
  • The car engine is always noisy
  • The battery shows signs of overcharging
  • When the car is running, the car lights and the car headlights will dim.
  • The alternator is not charging the battery.

Steps to identify the charging system-specific problemSteps to identify the charging system-specific problem

When the battery dies, the most common solution that immediately comes to mind is replacing all the components that you think are faulty. The fixation is expensive and may not be necessary. The only thing that you need to do is identify the problem’s source and fix it using the simple tools you have.

The earlier you fix the problem before it worsens, the better since it will save you money and a lot of headaches. Any simple issue such as a loose connection can transform into a bigger problem that can damage the component of the charging system resulting in a more expensive repair cost.

The following are the steps that you can follow to find the exact problem of the charging system.

1) Check the serpentine or the drive belt and replace it if you have never returned it since you bought the car. Inspect the belt for any damages like scratches and cuts, then test the tension of the belt. Crack in some of the car belts is not significant even when they are ready for a replacement. To know whether the belt needs replacement, consult the car owner’s user guide or use a belt wear indicator.

2) The second step after inspecting the belt is checking the belt tensioner. The belt tensioner should be turning smoothly and quietly. Otherwise, the belt tensioner is replaced together with the belt.

3) Check the battery connections. The connections should be tightly fixed and clean, free from corrosions, and in good condition.

4) Inspect the damages and the corrosions that may be available in the battery terminals and cables. The corrosions and cable breakages prevent the smooth flow of current, thereby preventing proper recharging of the battery.

5) Check for the damage in the battery that is causing it to leak charges. The best way to do that is to take the battery to the auto part store and test it.

6) Do a parasitic drain test. Even when the car’s ignition is off, a parasitic drain might be drawing your battery’s current. Connect the positive cable and the positive post to a test light. A trough in the battery is noticed when the test light lights up.

7)  Use a multimeter for hunting for the device causing the drain. Make sure that you know how to fix the multimeter.

8)  The next step is checking the alternator. If you are sure that the alternator is in good condition, skip this step. However, check the connections of the alternator to the battery. Tighten the loose ones and ensure that they are clean.

9) Inspect the ground connections. Ensure that the ground connections at the alternator and the voltage regulation are in good condition and shape and free from rust. In addition to that, ensure that the voltage regulator bolts and the alternator bolts are clean and tightly fixed.

10) The last step is checking the starter motor. A starter motor that is defective excessively draws power that drains the battery. It is essential to have the engine tested by a mechanic.

Reasons why your car battery keeps dying

  • When the car’s headlights or the dome lights are left overnight, the lights constantly drain the battery even when they are dim.
  • The connections of the battery are loose or corroded. Corroded connections prevent the current from topping off the battery.
  • There is a parasitic drain in the electrical system of the car. The parasitic drain not only makes the battery keep dying but also kills the battery ultimately.
  • The battery is weak and in poor condition. A weak battery that is not in good condition may not be able to hold the charge well.
  • The temperatures are either extremely hot or extremely cold.
  • There is a problem with the charging system of the car. Sometimes when the battery dies while driving, the problem might be the charging system.


The issue of dying batteries may be disgusting when not attended to immediately. The problems can cause a total death of the car battery or lack of power in the car. When the car battery keeps dying, but the alternator is good, the possible problem must be the charging system. The charging system problem might be in the battery itself or the battery and the alternator connections where the current passes.

The cause of the problem can be identified and solved at home using the steps given in this article. However, when you are not sure of what you are doing, it is advisable to get assistance from a mechanic or take the car to an auto repair store. 

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