Cummins N14 STC, Celect, Celect Plus – Service Manual 013-001   Alternator

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

Clamp an induction pickup type ammeter around the battery cable, or use digital multimeter, Part Number 3377161, with clamp or current probe, Part Number 3823574.

Disconnect any cables that lead to any other battery boxes in the circuit.

Operate the engine at high idle and measure the alternator voltage output to the batteries with digital multimeter, Part Number 3377161. Refer to the OEM service manual.

Operate the engine at high idle and adjust the battery tester 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 service manual.

If the gauge on the carbon pile load testing equipment does

not indicate approximately the same output as the induction-type ammeter, determine which is defective and replace it. Refer to the OEM service manual.

If the alternator output (amps) is not within 10 percent of rated output, repair or replace the alternator. Refer to the OEM service manual.

Shut off the engine and remove the test equipment.

Remove the electrical connections from the batteries.

Remove the electrical connections from the alternator.

Loosen the alternator to alternator support nut and capscrew.

Loosen the adjusting link capscrew.

Push the alternator toward the engine to release tension on the alternator belt, and remove the belt(s).

Remove the adjusting link capscrew and the adjusting link.

Remove the alternator to alternator support bracket nut, washer, capscrew, and the alternator.

NOTE: Do

not
tighten the alternator mounting and adjusting link capscrews and nuts until the alternator belt is installed and adjusted.

Install the alternator, capscrew, washer, and nut to the alternator mounting bracket.

Install the adjusting link and mounting capscrews.

Install and adjust the alternator belt.

Refer to Procedure 013-005 in Section 13.

Install and tighten the electrical connections to the alternator.

Install and tighten the electrical connections to the batteries.