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  2. Automotive battery - Wikipedia

    en.wikipedia.org/wiki/Automotive_battery

    Today, almost all road vehicles have a negative ground system. [11] The negative battery terminal is connected to the car's chassis. The Hudson Motor Car Company was the first to use a standardized battery in 1918 when they started using Battery Council International batteries. BCI is the organization that sets the dimensional standards for ...

  3. Ground (electricity) - Wikipedia

    en.wikipedia.org/wiki/Ground_(electricity)

    The use of the term ground (or earth) is so common in electrical and electronics applications that circuits in portable electronic devices, such as cell phones and media players, as well as circuits in vehicles, may be spoken of as having a "ground" or chassis ground connection without any actual connection to the Earth, despite "common" being ...

  4. DIN 72552 - Wikipedia

    en.wikipedia.org/wiki/DIN_72552

    VAG car relay. DIN 72552 is a DIN ... return to battery- or ground through switch 85d 31c return to battery- 12/24 V relay 31, 31a Electric motors; 32 return 31 33

  5. Chassis ground - Wikipedia

    en.wikipedia.org/wiki/Chassis_ground

    A chassis ground is a link between different metallic parts of a machine to ensure an electrical connection between them. [1] Examples include electronic instruments and motor vehicles. Usages

  6. Floating ground - Wikipedia

    en.wikipedia.org/wiki/Floating_ground

    Electrical equipment may be designed with a floating ground for one of several reasons. One is safety. For example, a low-voltage DC power supply, such as a mobile phone charger, is connected to the mains through a transformer of one type or another, and there is no direct electrical connection between the current return path on the low-voltage side and physical ground (earth).

  7. On-board diagnostics - Wikipedia

    en.wikipedia.org/wiki/On-board_diagnostics

    For ALDL connections, pin 9 is the data stream, pins 4 and 5 are ground, and pin 16 is the battery voltage. An OBD 1.5 compatible scan tool is required to read codes generated by OBD 1.5. Additional vehicle-specific diagnostic and control circuits are also available on this connector.

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