G 1500 1/2 Ton Van V6-4.3L VIN W (1997)
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Shorts between the commutator bars are some times produced by brush dust or copper dust.
5. Armature for opens.
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Look for loose connections where the conductors join the commutator bars. Poor connections cause arcing and burning of the commutator.
Testing The Armature For Grounds
6. Armature for grounds using a self powered test lamp.
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If the test lamp lights when one test probe is placed on the commutator and the other test probe is placed on the armature core or shaft, the
armature is grounded.
7. Brushes for wear. If the brushes are worn to half the size of a new brush, replace the assembly.
8. Brush holders for dirt or damage.
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Make sure that the brushes are not binding in the holders.
9. Brush springs for distortion or discoloring. If the springs are weak, bent, or discolored, replace the frame and field assembly.
10. Field coils.
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Look for burned or damaged insulation, damaged connections or loose poles. If the condition of the coils is doubtful, replace the field and
frame assembly.
11. Field coils for grounds.
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Connect a self-powered test lamp between the field frame and the field connector. Make sure the brush ends do not contact the field frame.
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If the test lamp lights, the field coils are grounded. Replace the field and frame assembly.
12. Field coils for opens.
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Connect a self-powered test lamp between the field connector and each of the positive brushes.
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If the test lamp does not light at both brushes, the field coils are open.
13. Field coils for shorts.
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Shorts are indicated by poor motor performance after everything else has been checked out. The coils cannot be replaced separately because of
the integral frame construction. The frame and field assembly must be replaced.
14. Drive assembly (clutch) by turning the drive pinion in the cranking direction.
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If the drive pinion turns roughly or slips in the cranking direction, replace the complete over-running clutch assembly.
Checking The Solenoid For Open Or Grounds
15. Solenoid for grounds using a self-powered 12 volt test lamp.
A. Connect the test lamp between the battery terminal and the case. The lamp should not light (terminal should not be grounded).
B. Connect the test lamp between the "S" terminal and the case. Then connect the test lamp between the "M" terminal and "S" terminal or "M"
terminal and the case. The lamp should illuminate.
C. If the solenoid does not pass these checks, replace it.
16. Hold-in winding and pull-in winding.
