Lincoln Electric SHIELD-ARC SVM128-A Service Manual page 70

F-16
9. Measure the rotor resistance to ground.
A. Set the ohmmeter on the high scale
(X100,000).
B. Place one probe on either of the rotor
slip rings. Place the other probe on any
good, unpainted ground.
F.3.
C. Check the resistance. It should read
very high, at least 0.5 megohm (500,000
ohms).
If the test does not meet the resistance
specifications, then the rotor may be
faulty. Replace the rotor.
TROUBLESHOOTING & REPAIR
ALTERNATOR ROTOR TEST (continued)
See Figure
FIGURE F.3 – MEASURING ROTOR RESISTANCE TO GROUND
10. Replace the brushes on the slip rings.
Make sure they are seated correctly.
11. Reinstall the alternator cover.
12. Close and latch the right and left side cover
doors.
SA-250
F-16