Oscillogram for a faulty alternator

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

One phase interrupted.

Repair/exchange alternator.

Fig 1: One Phase Interrupted Oscillogram

G04740395

Courtesy of BMW OF NORTH AMERICA, INC.

Interturn fault.

Repair/exchange alternator.

Fig 2: Interturn Fault Oscillogram

G04740396

Courtesy of BMW OF NORTH AMERICA, INC.

Open circuit in negative diode.

Repair/exchange alternator.

Fig 3: Open Circuit In Negative Diode Oscillogram

G04740397

Courtesy of BMW OF NORTH AMERICA, INC.

Short circuit in positive diode.

Repair/exchange alternator.

Fig 4: Short Circuit In Positive Diode Oscillogram

G04740398

Courtesy of BMW OF NORTH AMERICA, INC.

Open circuit in positive diode.

Repair/exchange alternator.

Fig 5: Open Circuit In Positive Diode Oscillogram

G04740399

Courtesy of BMW OF NORTH AMERICA, INC.

Open circuit in exciter diode.

Repair/exchange alternator.

Fig 6: Open Circuit In Exciter Diode Oscillogram

G04740400

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME/DDE.