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Home >> BMW >> 2009 >> 650i 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 893 (Engine Electrical System - Repair Instructions) >> Alternator With Drive And Mount >> 12 31 009 Checking alternator (BSD) >> Oscillogram for a faulty alternator:

Oscillogram for a faulty alternator:

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Fig 1: One Phase Interrupted
G03289812Courtesy of BMW OF NORTH AMERICA, INC.

Repair/exchange alternator.

Fig 2: Interturn Fault
G03289813Courtesy of BMW OF NORTH AMERICA, INC.

Repair/exchange alternator.

Fig 3: Open Circuit In Negative Diode
G03289814Courtesy of BMW OF NORTH AMERICA, INC.

Repair/exchange alternator.

Fig 4: Short Circuit In Positive Diode
G03289815Courtesy of BMW OF NORTH AMERICA, INC.

Repair/exchange alternator.

Fig 5: Open Circuit In Positive Diode
G03289816Courtesy of BMW OF NORTH AMERICA, INC.

Repair/exchange alternator.

Fig 6: Open Circuit In Exciter Diode
G03289817Courtesy of BMW OF NORTH AMERICA, INC.

Repair/exchange alternator.

Assemble engine.

Check function of DME/DDE.

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