An experienced motorist is well aware that sooner or later the terminals on the battery of his car can begin to oxidize. This phenomenon must be actively combated. However, it is also important to know and understand the reasons why this or that terminal is oxidized. The fact is that this can happen under the influence of various factors.
First of all, it should be noted that in most cases, two terminals of the battery are oxidized at once. This happens under the influence of natural factors as a result of the installation. In general, nothing “special” can be done about this phenomenon. The best thing that remains in such a situation is regular battery care, cleaning, as well as monitoring the charge level and liquid level. It is possible to provide some protection against oxidation of the terminals by installing felt washers soaked in oil under the terminals.
In this case, there are situations when only the right or only the left terminal is oxidized. The effects of this oxidation are just as negative as the effects of oxidizing both terminals. Any plaque and even more so rust is an extremely nasty conductor of energy. Ultimately, all vehicle systems that depend on the state of the battery begin to suffer. The increase in resistance (due to the formation of plaque on the terminals), in particular, leads to difficulty in starting the car.
If oxidation occurs only on the terminal with a "minus" value, then this most likely indicates that the battery is poorly charged and needs to be replenished as soon as possible. Otherwise, there is every chance that you simply will not start one fine morning.
If oxidation occurs only on the terminal with a "plus" value, then this in turn may indicate that the battery is too charged. The danger of this problem is that it is most likely not possible to establish the causes of its occurrence on your own.
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This requires special equipment and skills. This means you have to seek help from qualified specialists. Ultimately, it is important to understand the main thing: the appearance of any plaque on the battery terminals is a great reason to pay more attention to your car than usual.
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A source: https://novate.ru/blogs/100620/54845/