Service Manual

ISB, ISBe and QSB (Common Rail [...] Alternator
Section 13 - Electrical Equipment - Group 13 Page 13-5
To buy Cummins Parts and Service Manuals, Training Guides, or Tools go to our website at https://store.cummins.com
Initial Check
Check the drive belt and alternator pulley, to be sure the
alternator is rotating properly.
If any problems exist, check the following:
1 If the drive belt is slipping on the alternator pulley,
inspect the drive belt.Refer to Procedure 008-002 in
Section 8. Refer to Procedure 008-087 in Section 8.
Inspect the belt tensioner.
2 Remove the drive belt. Refer to Procedure 008-002 in
Section 8. Check if the alternator pulley is loose on the
shaft. If loose, remove the pulley and inspect for
damage. Refer to the alternator manufacturer's and/or
OEM service manual.
3 If the alternator will not rotate or does not rotate
freely, the alternator must be replaced. See the
Remove and Install steps of this procedure.
WARNING
Batteries can emit explosive gases. To reduce the
possibility of personal injury, always ventilate the
compartment before servicing the batteries. To
reduce the possibility of arcing, remove the negative
(-) battery cable first and attach the negative (-)
battery cable last.
Check the battery and all wiring connections.
Inspect the wiring for defects.
Check all connections for tightness and cleanliness,
including the slip connectors at the alternator and engine
compartment bulkhead, and the connections at the
battery.
Test
NOTE: Any multimeter reading of zero voltage indicates
an open circuit.
Check for open circuits.
Turn the keyswitch to the ON position.
Connect a multimeter, Cummins Part Number 3164488 or
3164489, to the following locations:
Delco™ Alternators
1 Alternator “BAT” terminal to ground
2 Alternator blade terminal “number 1” to ground
3 Alternator blade terminal “number 2” to ground.
Locate and repair the open circuit.