Bmw Alternator E39

Replacement 150 amp water cooled Bosch alternator for 1999-2001 E38 740i & 740iL, 1999-2003 E39 540i, and 2000-2003 X5 V8 (4.4 and 4.6 liter). Bosch is an original equipment supplier to BMW, and is the finest and most recognized German brand of alternator available. The alternator in the E39 serves a vital role: it charges the battery and powers the electrical systems while the engine is running.

A malfunctioning alternator can lead to a cascade of electrical issues, affecting everything from headlights to onboard computers. BMW's guidelines suggest that owners should pay attention to warning signs such as dimming lights, unusual noises, or battery. EDIT: Started with testing the battery & then added a section on testing the alternator.

EDIT: Ågent99 added a test for parasitic drain causing a dead battery overnight. EDIT: RDL added wiring diagrams and a test sequence for the starter and charging circuits. EDIT: Added how to best buy and.

In this tech article we will go over all the steps to change the alternator on your E39 (except the water cooled models). In order to remove the alternator you will need to remove the cooling fan, shroud, and accessory drive belt. See our tech articles on removing these components and follow the steps from there.

Bosch alternator for some E36, E39 6 cyl and Z3 that originally came with a Valeo brand alternator (rectangular connector). Buy Replacement Alternator for BMW 3 and 5 Series X5 E46 E39: Alternators. Alternator - BMW E39 / E46 / E53 / Z3 (many models check fitment) 12317501690-BOS Read Product Details ON SALE $506.92 $442.87 Pay over time with Affirm.

See if you qualify at checkout. BMW Parts BMW E39 Engine Electrical Alternator Your Vehicle Please tap 'Select' to pick a vehicle Select. According to this cut out (courtesy of bluebee's excellent "DIY how to test a BMW E39 battery & alternator" thread), terminal 15 should be showing battery voltage, but unfortunately it is ~1.3v too low.

Also, I think this safely explains one of the codes that turned up at the inspection - INSTRUMENT - IKE 90: Voltage Supply, terminal 15, faulty. Buy BMW part 12311407440 (12 31 1 407 440) BMW Compact Alternator 120A.