Checking the component

Check the carbon brushes. If the brushes are worn, replace the alternator control module (ACM). Check that the brushes can move in the regulator housing. The brushes are lightly sprung. At the same time, check the slip rings. Replace the generator (GEN) if they are worn out.

If the brushes and slip rings appear to be OK, try a new alternator control module (ACM) (charge regulator). If this does not help, try a new generator (GEN).

Remedy as necessary.

Other information: 

• See Checking wiring and terminals

Fig 2: Identifying Generator (GEN)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Refer to Verification