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Can A Bad Alternator Ruin A New Battery- Symptoms, Replacement, and Cycle Life

Feb 23, 2021   Pageview:17

An alternator is one of the most important parts of a car beside the engine and the mechanical components. It is because it is responsible for powering all the electrical equipment of the car along with charging the battery of the car while the engine of the car is started.

However, what most people do not know about it is that it can cause serious damage to your car if it goes bad. So, here we will discuss the alternator and what happens when the alternator of your car goes bad.

What are the symptoms of a bad alternator?

A bad alternator means that you will not only face issues while you start your car, but it can cause other issues like damaging the battery of your car. Additionally, it can also cause major damage to the computer and other electrical components of the car.

So, it is very important to know when the alternator of your car is not good. It is because getting it replaced will be the best option for your satisfaction and ease and the protection of your car’s components as well. The following are the symptoms of a bad alternator that you can easily figure out.

Unstable Lights

The first and the easiest to figure out the symptom of a bad alternator is the unstable working of the lights of the car. You will notice that the interior and the exterior light are not stable, and they are constantly fluctuating. They can be bright or dim depending on the issue with the alternator.

Smell of A Hot Wire or Burning Rubber

The second symptom of a bad alternator is the smell of burning wires. It can be sometimes difficult to figure out depending on the positioning of your car and the environment. In a well, ventilated area, it might be difficult to figure out.

Unusual Noises

A bad alternator is also known for making unusual noises. One of the most common symptoms of a bad alternator is that it will make loud growling noises.

These were some symptoms that you can easily notice, and they do not require any complex tools or working. This means that you can easily get to know about the health of the alternator of your car.

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When you are replacing the alternator, is it necessary to replace the battery?

Once the alternator of your car is damaged, the best solution is to get it replaced. Although this seems to be a simple thing, it is not as simple as it seems. It is because when the alternator is not good, it will cause damage to other components of the car as well.

The good thing is that most of the cars have protection for their electrical components however the battery is a part that has no protection.

You must test the battery.

When replacing the alternator of the car, you must check the battery of the car. It is because depending on the battery condition, you will also need to replace it. this might seem insignificant, but it is not because if the battery is bad, it can ruin the perfectly good alternator even on the first time of getting connected. So, it is very important to get the battery tested.

Can a good battery go with the new alternator?

Yes, if the battery is tested and it is in good health, there will be issues for connecting it to the new alternator.

Can a bad battery go with a new alternator?

Yes, the best thing that you can do is to replace the battery and alternator at the same time if the battery of the car is not in good health. It is because a bad battery can destroy the new alternator even on the first time of being used as mentioned above. So, it is a safe and intelligent decision to change both battery and the alternator at the same time.

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A new battery with a bad alternator, how long can they last?

The worst thing that can happen to you is that your car has starting issues and you get the battery replacement. This can because of a common human error of being careless or a cunning repairman can do this to make you spend more.

However, the worst combination is the one where the battery is new, and the alternator is not in good shape. So, when you have this installed in your car, how long can the system run before going bad again. Here we will discuss all about the bad alternating working with a good battery.

The shortest time in the worst case.

If it is your unluckiest of the days and you get a new battery installed in your car that has a bad alternator. The system will only work for about 30 minutes before going bad. However, if there are more issues with the system of the car, then the system might not last more than 5 minutes.

What if you get lucky?

If you are lucky, then the system can work in good condition for about 2 hours to a day. However, ultimately the system will go bad because the main part that is the alternator is not in good shape.

A little care can save you.

When we talk about the alternator and the batteries of your car, all you need is a little care that can keep you safe from all the frustration. So, here are some things that you can care for when you feel that there is an issue with the alternator.

?Never turn off your car once you have started it with a bad alternator unless you are at your final destination because the car will not start again most probably.

?Testing the alternator and the battery by yourself can save you time and money.

With this little care, you can stay safe from a lot of bad times.


An alternator is the part of the car that matters a lot if the car will work or not. So, it is very important to keep it in good shape. Here we discussed the relation between an alternator and a battery and how you can deal with a bad alternator.


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