SHOP MANUAL
Engine
Ch 1 page 166
Length of brushes
Check that the length of the carbon brushes does not fall below the permitted length, see specification.
Slip rings/Rotor resistance/Overcharging
The charge regulator must be removed in order to check the slip rings.
1. Check that the surfaces of the slip rings are smooth and bright. If the surfaces are not bright, this
indicates poor contact with the carbon brushes.
2. Measure the rotor resistance, see measurement specification. Refer to figure 322.
3. Measure the insulation resistance between the slip
rings and alternator core (chassis earth).
The ohmmeter must show infinite resistance (at least 10 MOhm).
If one of the checks is not satisfactory, the alternator
must be renewed.
Figure 322
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