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F-17
7. 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. See Figure F.3.
c. Check the resistance.
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.
8. Replace the brushes on the slip rings. Make
TROUBLESHOOTING & REPAIR
ALTERNATOR ROTOR TEST (continued)
It should read
FIGURE F.3 – MEASURING ROTOR RESISTANCE TO GROUND
Classic III and IIID
sure they are seated correctly.
9. Reinstall the alternator cover and wrap-
around.
F-17
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