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TROUBLESHOOTING & REPAIR
ROTOR RESISTANCE TEST (continued)
FIGURE F.2 – LEADS 200A AND 219 REMOVED
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TEST PROCEDURE
1.With the 5/16” and 3/8” nut drivers, remove the sheet metal screws from the right hand case side.
2.Carefully remove the right case side.
3.Conduct the test with the engine OFF.
4.Isolate the rotor electrically by removing the generator brush leads. Refer to Figure F.2 as you perform the remaining steps.
5.Remove lead #219 from the negative brush.
6.Remove lead #200A from the positive brush.
7.Measure the resistance across the rotor slip rings.
a.Set the ohmmeter on the low scale (X1).
b.Place one meter probe on one of the rotor slip rings. Place the other probe on the other slip ring.
c.Check the resistance across the slip rings. It should read approximately 5 or 6 ohms.
8.Measure the resistance to ground.
A.Set the ohmmeter on the high scale (X100,000).
B.Place one probe on either of the slip rings. Place the other probe on any good unpainted ground. The machine ground stud works well.
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.
If the test does meet the resistance speci- fications, then the rotor is okay.
9.Connect lead #200A to the positive brush, which is the one nearest the rotor lamina- tion. Connect lead #219 to the negative brush.
10.Reinstall the right case side using the sheet metal screws and the 5/16” and 3/8” nut drivers.
RANGER
