ISBe/ISB Series Engines – 013-001   Alternator

Check the drive belt and alternator pulley, to be sure the alternator is rotating properly.

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.

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.

Connect a carbon-pile load (battery/alternator tester) across the batteries in one of the battery boxes.

Clamp an induction pickup-type ampere-hour meter around the battery cable; or use the digital multimeter, Part Number 3164488 or 3164489, with the clamp-on current probe, Part Number 3164490.

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.

WARNING  Acid is extremely dangerous and can damage the machinery and can also cause serious burns. Always provide a tank of strong soda water as a neutralizing agent when servicing the batteries. Wear goggles and protective clothing to reduce the possibility of serious personal injury.

Disconnect any cables that lead to any other battery boxes in the circuit, negative (-) cables first.

Operate the engine at high idle; and measure the alternator voltage output to the batteries with digital multimeter, Part Number 3164488 or 3164489. Refer to the OEM service manual.

Operate the engine at high idle and adjust the carbon-pile load-testing equipment to apply the maximum rated amperage load to the alternator. Refer to the OEM service manual.

NOTE: The alternator maximum rated amperage output is normally stamped or labeled on the alternator.

Measure the alternator amperage output. Refer to the OEM specifications.

If the alternator output (amperes) are not within 10 percent of rated output, repair or replace the alternator. Refer to the OEM service manual for repair procedures.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To avoid arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Acid is extremely dangerous and can damage the machinery and can also cause serious burns. Always provide a tank of strong soda water as a neutralizing agent when servicing the batteries. Wear goggles and protective clothing to reduce the possibility of serious personal injury.

Shut off the engine and remove the test equipment.

Connect all battery cables, negative (-) cable last.

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.

WARNING  Acid is extremely dangerous and can damage the machinery and can also cause serious burns. Always provide a tank of strong soda water as a neutralizing agent when servicing the batteries. Wear goggles and protective clothing to reduce the possibility of serious personal injury.

• Disconnect the ground cable from the battery terminal.
• Remove the drive belt from the alternator pulley.Refer to Procedure 008-002 in Section 8.
• Tag and label all wires on the alternator.
• Disconnect the wires.

Spool Mount

Remove the upper alternator link capscrew.

Remove the mounting capscrew and nut at the bottom of the alternator and alternator mounting bracket.

Remove the alternator.

Pad Mount

Remove the alternator mounting capscrews.

Remove the alternator.

Hinge Mount

Remove the alternator link capscrew.

Remove the alternator mounting capscrew.

Remove the alternator.

Spool Mount

Install the alternator and the bottom alternator mounting capscrew and nut.

Install the upper alternator link mounting capscrew at the top of the alternator.

Tighten the capscrews.

Pad Mount

Install the alternator.

Install and tighten the alternator mounting capscrews.

Hinge Mount

Install the alternator.

Install and tighten the alternator mounting capscrew.

Install the alternator link capscrew.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To avoid arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Acid is extremely dangerous and can damage the machinery and can also cause serious burns. Always provide a tank of strong soda water as a neutralizing agent when servicing the batteries. Wear goggles and protective clothing to reduce the possibility of serious personal injury.

• Connect all wires to the alternator.
• Install the drive belt. Refer to Procedure 008-002 in Section 8.
• Connect the battery ground cable. Refer to Procedure 013-009 in Section 13.
• Operate the engine and check for proper operation.