24-31-40 Functionality Check
After assembly the alternator has to be checked if the full functionality is given.
Fig. 24 - 42 Alternator E4A-91-400-000
Measure the resistance of the excitation winding.
Test Case 1:
Adjustment Multimeter:
- Resistance
Measuring points:
- Excitation Winding
- Alternator housing
Nominal value:
- 2,5 – 9,0 Ohms
If the value is above 9 Ohms verify that the brush holder is assembled correctly as
stated in Chapter 24-00-50.Rotate the pulley and repeat the measurement.
If the value is again above 9 Ohms, replace the alternator.
If the excitation winding resistance is above 10 Ohms, the brushes are defect or not
released. Verify that the brush holder is assembled correctly as stated in Chapter
24-00-50.
If the brush holder is assembled correctly and the excitation winding resistance is still
above 10 Ohms, replace the alternator.
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