There are many issues that can prevent a car from starting. Problems with the battery or alternator are among the most common causes behind this issue. However, it sometimes becomes hard to determine if you are dealing with a bad battery or alternator. To identify the real culprit, you must know the signs of a bad car battery vs alternator along with their proper functioning.
In this guide, we have compiled the list of the difference between a dead battery or alternator failure symptoms.
Battery Vs Alternator: What’s the Difference?
Generally, when the car won’t start or its electrical part stops working, it could be a problem with the alternator or battery.
Your car battery and alternator are crucial parts of the vehicle’s electrical system. Hence, you cannot start a vehicle if any of them goes bad. Unfortunately, your car battery and alternator share almost similar symptoms, spotting them on time can save you from long-term damage.
Signs of a Bad Alternator
The car alternator plays a critical role in vehicle operation, for instance, it supplies power to the car’s headlight. Essentially, it converts the mechanical energy of the crankshaft into electricity by induction. The alternator provides power to the car’s accessories – from headlights to windshield wipers. It also keeps the battery fully charged, which is responsible for providing the energy needed to start the car. A faulty alternator can be the reason why my car starts but then dies immediately.
Once the alternator is connected to other critical systems in the vehicle, it can create some mechanical difficulties. This further complicates the diagnosis of car problems. However, paying attention to the following signs will make it easier to know if the fault is in the alternator or the car’s battery.
Warning Light
The dashboard warning light also indicates if there is something wrong with the alternator. Many people see this sign and think they have a problem with the battery, but the sign refers to the alternator.
Headlights Too Bright or Dim
As the alternator supplies the electricity to the vehicle, hence when it starts to lose its potential, it is immediately noticeable. The headlights of the car may have a very dim light or light irregularly, they may even flicker. This means that the alternator has faults and does not provide enough power.
Failure to Start and Recurrent Engine Stops
A deteriorated alternator fails to properly charge the car’s battery. Likewise, if the battery does not have enough energy, it is impossible to start the engine.
If the engine stops immediately after a quick start, it means that the alternator has a problem. But if the engine does not start and you notice that the headlights work correctly then there might be an issue with a self-starter motor.
Loose or Broken Connections
There could be several other issues that can point to the problem with your car alternator. Electrical faults such as strange sounds from the stereo system, a power window that works slowly and speedometers that spin strangely. All these defects are possible in the presence of a deteriorated alternator.
Signs of a Bad Car Battery
Here are some common signs which can tell you that the problem is not with the alternator:
The Engine Starts Slowly or Won’t Start
Your car starts and dies immediately for several reasons, however, checking the battery in the first place is essential. You can also use jumper cables and try to start it. Here is how you can deal with a dead car battery.
Battery with Corrosion
As long as the battery terminals are corroded, they disable electrical power so the car battery cannot receive the proper charge. Excessive corrosion on a battery may need a prompt replacement or the removal of the battery corrosion.
Expired Battery
In general, the useful life of a car battery is between 2 to 3 years. Old car batteries easily accumulate corrosion due to leaks and deterioration from continuous use. The old car batteries also can’t hold enough power to start the car. It is best to replace the car battery for a smooth ride.
Strange Smell
A lead acid battery releases sulfuric gas, giving off the strange and unpleasant smell of rotten eggs. If you detect battery leakage, it is best to replace it immediately.
You can also test the car’s battery performance, in case you are dealing with these symptoms. Testing a battery can be done with a voltmeter or taken to specialist stores where it can be checked.
With this, we conclude our guide on signs of the dead battery or alternator. Being able to diagnose whether the problem is with the bad battery or the alternator is relatively easy. If you are planning to buy a used car in the UAE, then you must check its battery and alternator to see if they need any repair or replacement.
If you find this guide useful, stay tuned to the UAE’s leading auto blog for more.
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