Genuine BMW 2500 Alternator

BMW 2500 Alternator Parts Questions & Experts Answers

• Exchange Alternator
  12311277248
  Q: What is the function and maintenance of an alternator on BMW 2500?

  A: The alternator generates current for various electrical equipment and charges the battery while operating at all engine speeds, producing alternating current that is rectified to direct current by diodes in the casing. It is driven by a belt from the crankshaft pulley and requires minimal maintenance, primarily checking belt tension and the condition of wiring connections, while keeping the exterior clean, especially around ventilation holes. The alternator should never operate with a disconnected battery or reversed battery cables, and connections must be made carefully; disconnection is necessary before any electric welding on the vehicle, and starting the engine with a battery charger connected is prohibited to avoid damage to components, particularly diodes. Designed for long-lasting service, any faults should be addressed by a qualified service station or through the installation of a reconditioned unit. To test the alternator's charging capability, one can switch on the headlamps after dark and start the engine; if charging occurs, the headlamps will brighten as system voltage increases. If not charging, wiring and connections should be inspected, and if the ignition warning light remains on while the engine runs, a simple electrical test can be performed by disconnecting the regulator unit and joining specific wire connectors; if the warning light goes out, the regulator is defective, otherwise, the alternator needs servicing. For removal, the battery negative cable must be disconnected, followed by the disconnection of the multiple plug and single cable from the alternator, noting the wire connections. The alternator mounting bolts should be loosened, allowing the unit to swing towards the engine to release the drive belt before removing the alternator. Reinstallation follows the reverse order, ensuring proper belt tension adjustment.