Where is the negative terminal of the BMW 3 Series?

1 Answers
EverettFitz
07/29/25 8:07pm
The negative terminal of the BMW 3 Series is located behind the right front headlight and is a metal post. Introduction to negative grounding: Negative grounding refers to all power sources and electrical equipment in the car, where the negative terminal is directly connected to the car body. The car body serves as the common circuit for the electrical system. After switching to negative grounding, the electrochemical corrosion in the car's electrical system is significantly reduced. Principle of negative grounding: The car body is connected to the negative terminal of the battery. The battery in the car is mainly a lead-acid battery, with lead dioxide on the positive plate and pure lead on the negative plate, and the electrolyte is dilute sulfuric acid. After negative grounding, the negative plate of the battery has free lead ions and electrons, with a potential of -0.1V, and the electrons on the negative plate are in an excess state. In this case, the negative terminal of the battery can provide electrons to the car body steel plate at any time, making the steel plate less likely to lose electrons and less prone to oxidation.
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