Permanent plus

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As a permanent positive in are electric vehicle electric circuit of a motor vehicle means any contacts permanently to the positive terminal of the starter battery are connected, so both inbound and when switched ignition . Some manufacturers refer to these contacts as terminal 30 or B +.

Use of the permanent plus

Permanently plus supplies those control units and assemblies that have to be functional even when the vehicle is parked or that require electrical energy, for example to hold data. In any case, the switch for the hazard warning lights and any central locking , usually also the interior lighting, which is switched via door contacts and the central locking, is supplied with permanent plus .

In the area of ​​convenience electronics, for example, the radio, odometer (trip meter), anti-theft alarm system, GPS receiver and remote unlocking / keyless entry also require permanent electrical power. The steady increase in the number of electrical standby consumers means that when cars are parked for longer periods of time, the risk of finding a discharged starter battery when attempting to start increases increases .

For many electrical consumers , it depends on the vehicle manufacturer whether they are connected to permanent or ignition plus , for example cigarette lighter , car radio , driving lights, electric windows , brake lights , horns , etc.

In a few vehicles, the positive pole of the battery is connected to the body so that there is a permanent power supply via permanent negative.

Specialist literature

Reference books

  • Rudolf Hüppen, Dieter Korp: Car electrics all types. Motorbuchverlag, Stuttgart, ISBN 3-87943-059-4
  • Jürgen Kasedorf, Richard Koch: Service primer for vehicle electrics, Vogel Buchverlag, ISBN 3-8023-1881-1

Technical brochures

  • Bosch technical instruction for circuit symbols and circuit diagrams for vehicle electrics. Robert Bosch GmbH, Stuttgart, VDT-UBE 001/10

See also

Web links