Standard terminal designations
The multi-colored mixing of wires in a car is actually very well ordered, because many parts of the electrical equipment of the car are standardized. The numbers on different nodes and connecting elements of wires, as well as in electrical diagrams on all German and on some foreign cars have the same meaning:
Terminal 15 is only supplied with power when the ignition is switched on from the ignition switch, while, in addition to the DIS ignition module, those electrical consumers are supplied with power that should only receive current during vehicle operation. For wires to standard terminals 15, in most cases, the sheath is black, sometimes with a colored additional strip.
Terminal 30 receives direct current from the battery positive or from the alternator when the engine is running. If the tools are handled carelessly, this can lead to short circuits or cause a rain of sparks if the wire connected to the battery minus is not removed. These wires, which are always energized, are in most cases red, sometimes with additional colored stripes.
Terminal 49 refers to the intermittent and emergency light system.
Terminal 53 supplies voltage to the windscreen cleaning system.
Terminal 56 supplies current to the dipped beam headlights through the yellow wires, as well as to the high beam headlights through the white wires.
Terminal 58 supplies power to the front parking lights, as well as to the rear and license plate lights. The main color of the wire sheath is gray, sometimes with an additional color stripe.
Terminal 31 is a ground terminal, through which the electrical consumer must be connected to the vehicle ground in order to close the electrical circuit. Corresponding wires have a brown sheath.
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