Alternator - How to check the correctness of the alternator?

alternator

Alternator

We call the alternator an electric generator that charges all the appliances on the car and also charges the battery. The generator acts like a small power plant that supplies electricity when the vehicle needs it. Generators are divided into dynamos and alternators.

Dynamos are direct current generators while alternators are alternating current generators. Certainly, most cars in today's world have alternators, ie alternators, because they are stronger and at a very low speed give electricity to charge the battery. In order to charge the battery, it needs direct current, so the alternator has a rectifier that is there to convert alternating current to direct current.
There are frequent problems with the alternator, so we can often hear the sentence: 'My alternator is gone!' There is a light on the instrument panel that lights up if we have problems with this part. If it starts, it is a sign that the engine is in danger. Namely, when the control lamp for the alternator comes on, faku means that the car can stop soon, and the engine will malfunction, to a greater or lesser extent. In some cases, the appearance of the control lamp can be a harmless fault such as contact, which we will, of course, easily solve. However, in the most severe cases, it can mean the complete cessation of the operation of the alternator because battery without it, it can only deliver electricity for a short time. When the light comes on, the belt that drives the alternator can also break, which can also become a big problem. In addition to the belt, a malfunction caused by the regulator is also common, most often due to the wear of the brushes, but also a malfunction in the electronic part of the regulator. The malfunction of the regulator can be easily sniffed because it can cause a strong acid odor in the cabin. Then open the bonnet and check the upper surface of the battery. If it is wet, it means that acid is coming out of the battery because the charge is too strong. Regler is responsible to be battery charge properly, so in this case it needs to be replaced. Alternator malfunction can also occur when the light comes on only when the ignition is switched on and later, when the engine is running, it goes out.
In addition to all this, before any malfunction occurs, it is good to perform various measurements. For example, it is good to have a special device that you can buy, or, if it is an oversized item, then have your car mechanic measure the battery voltage. The battery voltage must be between 13,5 and 14 V. The voltage should be measured while the engine is running, but also at the very moment of ignition, because if it falls below 10 V, the battery itself is low. When there is voltage fluctuation on the battery itself, it is a sign that the alternator is also not working properly and may have a malfunction.
The alternator itself can be tested. During the test, the alternator should be brought to an operating temperature of 25 degrees, then turn off the engine and separate the minus pole of the battery of ground, then an ammeter clamp should be placed on the conductor of the B + terminal, and a voltmeter should be placed between the B + terminal and ground. After that, the regulator should be disconnected from the alternator, the connection from the negative pole of the battery should be restored and then the D + and DF terminals on the alternator should be connected. Then contact and switch on the high beam and check that the control indicator illuminates. The engine should then start and the light should go out. It is necessary to slightly increase the engine speed until the alternator itself achieves the same. When the alternator is correct, the ammeter will show a current close to the nominal value of 2/3 Imax.
Source: www.silux.hr

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