Alternator Replacement

• Alternator 150A — exact-fit replacement

  In stockOEM 8V21-10300-BB

  £189.00

  Find part

• Auxiliary drive belt

  In stock

  £24.50

• Socket set (8-19mm)
• Torque wrench
• Serpentine belt tool
• Trim removal tool

Procedure

1. 1

   Disconnect the negative battery terminal and wait 2 minutes to discharge any residual current in the system.

   Warning: Failure to disconnect can short the new alternator on install.

2. 2

   Remove the engine undertray (4× 10mm bolts) to access the alternator from below.

3. 3

   Release the auxiliary belt tensioner with the serpentine belt tool and slip the belt off the alternator pulley.

4. 4

   Unplug the alternator's wiring connector and unscrew the B+ output nut on the back of the unit.

5. 5

   Unbolt the two alternator mounting bolts and lower the old unit out through the bottom of the engine bay.

6. 6

   Install the new alternator in reverse order. Torque both mounting bolts to spec before refitting the belt.

   Torque: 48 Nm
7. 7

   Refit the belt, reconnect wiring, refit the undertray, and reconnect the battery. Start the engine and confirm the battery light is off and charging voltage is 13.8-14.6V at idle.