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Home >> BMW >> 2001 >> 330Ci 2D Convertible, Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Charging Systems - Overview >> Charging Systems >> Purpose of The Charging System
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Purpose of The Charging System

The purpose of the charging system is to convert the mechanical energy of the engine into electrical energy that is used to recharge the battery and power the electrical accessories. When the engine is first started, the battery(s) supplies all the current required by the starting and ignition systems.

As the battery drain continues and engine speed increases the charging system is able to produce more voltage than the battery can deliver. When this occurs, the electrons from the charging device are able to flow in a reverse direction through the battery's positive terminal. The charging device now supplies the electrical system's load requirements and recharges the battery.

The charging system consists of:

Fig 1: Identifying Battery Charging System
G03390195Courtesy of BMW OF NORTH AMERICA, INC.