Field Winding Continuity Test
- Remove the rear cover.
Illustration 1 | g00825532 |
Field Winding Continuity Test (6) Field winding leads |
- If the alternator has a capacitor, remove the capacitor.
- Remove the regulator.
- Connect the multimeter leads across field winding leads (6). This is shown in Illustration 1.
- Measure the resistance between the field winding leads.
Expected Results:
- M1 Series Alternators ... 9 ± 0.1 ohms
- HDB Series Alternators ... 8.2 ± 0.4 ohms
Results:
OK - The resistance is within tolerance. The field winding is normal. STOP.
NOT OK - The resistance is above tolerance. The field winding has an open circuit. Replace the field winding. STOP.
NOT OK - The resistance is below tolerance. The field winding has a short circuit. Replace the field winding. STOP.
- M1 Series Alternators ... 9 ± 0.1 ohms
Field Winding Ground Test
- The rear cover, the capacitor, and the regulator remain removed from the alternator.
Illustration 2 | g00825533 |
Field Winding Ground Test (6) Field winding leads (7) Rear frame |
- Connect the multimeter leads across rear frame (7) and one field winding lead (6). This is shown in Illustration 2.
- Measure the resistance.
Expected Result: The resistance is greater than 100000 ohms.
Results:
OK - The resistance is greater than 100000 ohms. Repeat steps 1 to 3 for the other field winding lead (6). If all of the results are OK, the stator is normal. STOP.
NOT OK - The resistance is NOT greater than 100000 ohms. The field winding lead is shorted to the frame. Replace the field winding. STOP.