Service Manual

7. Troubleshooting10-2019
161A062J683 (Issue 1) Copyright © 2019 Cummins Inc.
8. Measure field, quadrature, and main winding resistance.
• Clean the slip rings, replace the brushes, repair the harness, and replace
the rotor and stator assembly if necessary.
9. Check brush alignment:
a. Inspect brush wear on the slip rings and verify brush misalignment is
toward the windings.
b. If the misalignment is toward the bearing, the cause is not a tolerance
issue but is more likely the result of the end bell not being seated properly
during assembly.
• Inspect for cause and repair if necessary.
Code 29 - High Battery Voltage
Logic: DC voltage to controller greater than 19 VDC.
Possible Causes:
• Wire damage
• Faulty charger
• Control
Diagnosis & Repair:
1. Check the last fault recorded.
• If this fault has not been repaired, troubleshoot that fault.
2. Measure DC voltage at the battery, at the generator set, and at connector P1.
• Reconnect the battery or repair wiring if necessary.
3. Measure DC voltage with the battery charger turned on.
• If the DC voltage is near or above 19 V, perform the appropriate battery
charger troubleshooting in Section 7.6 on page 134 or Section 7.7 on
page 137.
4. Disconnect the generator set control P1 connector.
5. Verify that the P1 pin socket is fully inserted and inspect the pin socket
condition for corrosion and acceptable condition of contact wipers. To check
contact wipers, use one of the devices below:
• A mating pin connector
• A pin gauge the same size as the mating control connector pin (0.045 in)
• Any suitable device that will not damage the inside contact wipers of the
pin socket
If necessary:
• Clean, repair or replace the pin socket.
• Fully insert any partially inserted pin socket.