12 32 501 Replacing controller switch for alternator (N62)

Necessary preliminary tasks: 

• Disconnect battery negative lead.
• Remove alternator.

Carefully insert a screwdriver between cover (1) and threaded pin.

Lever out cover (1) towards top.

Fig 1: Levering Out Cover Towards Top

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Release contact screws (1).

Unscrew nut (2).

Remove controller switch (3).

Fig 2: Removing Controller Switch

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Check contact surfaces (1) of slip rings for wear and recondition if necessary.

Fig 3: Checking Contact Surfaces Of Slip Rings

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Press in carbon brushes (1) of controller switch (2) in direction of arrow.

Install controller switch (2).

Fig 4: Installing Controller Switch

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Insert and tighten down contact screws (1).

Fig 5: Tightening Down Contact Screws

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Insert nut (2) and tighten down.

Assemble alternator.

Assemble engine.

Carry out alternator test with diagnostic system.