Alternators are great replacements for generators on cars. With alternators, the output current can be generated at lower rpm, the voltage can be controlled precisely, less maintenance is required and they need lesser production budget. Automotive alternators are rated in terms of the amperage that they generate.
The basic function of your BMW alternator is to produce direct current for recharging the battery and for motorizing the vehicle's electrical loads. With that vital task, BMW alternators need to be maintained and taken cared of. There are several steps which you can apply to keep your BMW alternator in tiptop shape and condition. Check the BMW alternator's drive belt tension at every oil change. A belt that's loose can lessen the output of the alternator and run down the car's battery as well. Before you travel every spring, it is always advisable to have your BMW alternator tested as part of a complete starting, charging and battery test.