Did you ever had this trouble trying to start your car in the morning and it doesn’t work ? If that didn’t happen to you, at minimum you’ve already had that apprehension. So when you find out an alternator noise on Bmw Serie 3 E90, you can already see yourself breaking down, stuck waiting for the tow truck. That’s why our team has decided to produce this post to help you find the sources of alternator sounds. In this article, you will first learn the role and functions of the alternator in your Bmw Serie 3 E90 and then what the causes and solutions to alternator noise on Bmw Serie 3 E90 may be.
Role and alternator operation Bmw Serie 3 E90
Alternator role
Your alternator is an essential part of your Bmw Serie 3 E90. Indeed, its goal is to give power to your entire electrical system: headlights, interior lighting, signalling, computer… It will have the goal of recharging the battery once the vehicle is in motion, to provide power to the vehicle in motion and to allow you to always have a enough energy reserve to be able to restart the next time.
Alternator functioning
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The alternator operates on an electrical principle that has been used for decades, the principle of copper coil wound around a magnet . This coil while spinning makes electricity. It is the engine motor itself that will furnish the energy required by the alternator to produce the energy, via the accessory belt or alternator belt. When your Bmw Serie 3 E90 engine stops, the battery takes over to furnish the vehicle with energy.
What are the distinctive alternator noises or sounds on my Bmw Serie 3 E90 and what are the causes?
I discover a knocking noise from the alternator of my Bmw Serie 3 E90
One of the typical noises of a tired alternator on Bmw Serie 3 E90 is a knocking noise. This alternator sound on Bmw Serie 3 E90 will most of the time happen when your engine is idling, it can be linked to voltage drops that could disrupt the normal operation of electrical parts such as headlights for example. Often, it is a of both bearings of the alternator that is faulty, to verify it, use a multimeter on the terminals of your vehicle with the engine running and you must get a value between 12 and 14.7 volts, which means that your alternator is recharging your battery well. If the value is lower, the alternator of your Bmw Serie 3 E90 is tired and you should consider changing the bearing if it is the only reason otherwise the entire part.
I find out a grinding noise coming from the alternator of my Bmw Serie 3 E90
If you are in the situation where the alternator of your Bmw Serie 3 E90 generates grinding sounds, in this circumstance you will have to look into it more seriously. This symptom can testify as for the knocking sound of a tired bearing, but usually, we often realise by looking more closely that it is the accessory belt that is loosened or worn and is therefore the reason of it. In this circumstance, we recommend that you read this document to find all the necessary information to solve an accessory belt noise on Bmw Serie 3 E90.
I find out a loud noise from the alternator of my Bmw Serie 3 E90
Listening a loud noise from the alternator of your Bmw Serie 3 E90 is quite normal, in fact, it emits an audible sound when producing the electrical pulses it generates. It is up to you to verify that the battery indicator light on your dashboard does not appear, and that you do not have a voltage drop when your engine is running (headlight or dashboard light that jumps for example. If this noise is too loud, we recommend that you check out this document to find other ways to solve problem of noises from front end on Bmw Serie 3 E90.
