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TROUBLESHOOTING & REPAIR
ROTOR RESISTANCE TEST (continued)
FIGURE F.11 – ROTOR BRUSH LEADS
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SLIP RINGS
LEADS REMOVED
TEST PROCEDURE
1 Conduct this test with the engine off.
2.Using the 3/8" wrench, remove the left front case side.
3.Locate, label and remove the three leads from the rotor brush holder assembly. See Figure 11. This will electrically isolate the rotor windings.
4.Using the ohmmeter, check the rotor winding resistance across the slip rings. Normal resistance is approximately 23.5 ohms.
5.Measure the resistance to ground. Place one meter probe on either of the slip rings. Place the other probe on any good unpaint- ed ground. The resistance should be very high, at least 500,000 ohms.
6.If the test does not meet the resistance spec- ifications, then the rotor may be faulty. Replace.
7.Connect the leads previously removed from the brush assembly. Make sure the leads are connected to the proper brushes.
8.Replace the left front case cover previously removed.
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