This procedure covers the removal and replacement of the alternator on a 2014 Ram 2500 with the 6.7L Cummins diesel engine.

Warnings

Tools required

Parts

• Alternator (180-220 amp depending on configuration) × 1 — Use OEM specification or quality aftermarket
• Serpentine belt (if worn or damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely (minimum 1 hour)
3. Open hood and secure in upright position
4. Photograph or diagram serpentine belt routing for reference
5. Disconnect negative battery cable and secure away from terminal

Procedure

1. 1

   Disconnect battery
   Loosen and remove the negative battery cable from the battery terminal. Secure the cable away from the terminal to prevent accidental contact. Wait at least 2 minutes for electrical system to discharge.
   Torque spec

   Battery Terminal Bolts8 Nm (6 lb-ft)
2. 2

   Remove serpentine belt
   Locate the automatic belt tensioner on the front of the engine. Using an 18mm wrench or serpentine belt tool, rotate the tensioner clockwise to relieve tension on the belt. Slide the belt off the alternator pulley first, then carefully release tensioner and remove belt from remaining pulleys. Inspect belt for wear, cracks, or glazing.
3. 3

   Access alternator electrical connections
   Locate the alternator on the driver side of the engine, below the power steering pump. The alternator has two electrical connections: a large B+ output cable with a nut, and a smaller field connector plug. Note the routing of these wires for reinstallation.
4. 4

   Disconnect alternator wiring
   Pull back the rubber protective boot on the B+ terminal. Remove the nut securing the B+ output cable to the alternator and carefully move the cable aside. Press the tab on the field connector plug and pull straight out to disconnect. Secure wires away from work area.
   ⚠Do not allow B+ cable to contact ground or other metal surfaces during removal
5. 5

   Remove lower alternator mounting bolt
   Locate the lower alternator mounting bolt at the base of the alternator bracket. This is the primary load-bearing bolt. Using appropriate socket and extension, remove the bolt completely and set aside. The alternator will now pivot on the upper bolt.
   Torque spec

   Alternator Mounting Bolts50 Nm (37 lb-ft)
6. 6

   Remove upper pivot bolt
   Locate and remove the upper alternator pivot bolt. This bolt passes through the alternator mounting ear and threading into the engine bracket. Support the alternator with one hand while removing this bolt to prevent it from falling.
   ⚠Support alternator weight before removing final bolt to prevent damage or injury
   Torque spec

   Alternator Pivot Bolt25 Nm (18 lb-ft)
7. 7

   Remove alternator from vehicle
   Carefully maneuver the alternator out of the engine bay. On 4WD models, you may need to angle the alternator to clear the front differential and other components. Lift straight up and out once clear of mounting bracket.
8. 8

   Prepare new alternator
   Compare the new alternator to the old unit to verify correct pulley alignment, mounting ear positions, and terminal locations. Clean the mounting surfaces on the engine bracket using a wire brush to remove any corrosion or debris. Apply a small amount of dielectric grease to electrical terminals on new alternator.
9. 9

   Install new alternator
   Carefully position the new alternator into the mounting bracket, angling as necessary to clear surrounding components. Align the mounting ears with the bracket holes. Insert the upper pivot bolt finger-tight first to hold the alternator in position.
10. 10

    Install and torque mounting bolts
    Install the lower alternator mounting bolt finger-tight. Ensure both bolts are properly threaded and alternator is seated flush against mounting surfaces. Using a torque wrench, tighten the lower mounting bolt to 50 Nm (37 lb-ft), then tighten the upper pivot bolt to 25 Nm (18 lb-ft).
    Torque spec

    Alternator Mounting Bolts50 Nm (37 lb-ft)

    Alternator Pivot Bolt25 Nm (18 lb-ft)
11. 11

    Reconnect alternator wiring
    Route the field connector wire to the alternator and press firmly until the connector clicks into place. Position the B+ output cable over the alternator terminal stud, install the nut, and torque to 18 Nm (14 lb-ft). Slide the rubber protective boot back over the terminal.
12. 12

    Install serpentine belt
    Following the belt routing diagram (or your reference photo), route the new or existing belt around all pulleys except the alternator. Rotate the tensioner clockwise to create slack, then slide the belt onto the alternator pulley. Carefully release the tensioner to apply proper tension. Verify belt is properly seated in all pulley grooves.
13. 13

    Reconnect battery
    Reconnect the negative battery cable to the battery terminal. Torque the battery terminal bolt to 6 Nm (4 lb-ft). Do not overtighten as this can damage the battery terminal.
    ⚠Battery terminals are soft lead and easily damaged by overtightening
    Torque spec

    Battery Terminal Bolts8 Nm (6 lb-ft)

Reassembly

1. Verify all electrical connections are secure and properly routed
2. Confirm serpentine belt is properly seated in all pulley grooves with no twists
3. Double-check all mounting bolts are torqued to specification
4. Ensure no tools or parts are left in engine bay

Verification

• Start engine and verify charging system warning light turns off within 2-3 seconds
• Using a multimeter, check battery voltage with engine running - should read 13.8-14.5 volts
• Turn on high electrical loads (headlights, HVAC blower, rear defrost) and verify voltage remains above 13.5 volts
• Listen for unusual noises from alternator or belt squealing indicating misalignment
• Inspect alternator and connections after 5 minutes of running for signs of heat, smoke, or loose connections
• Test drive vehicle and monitor battery/charging warning lights on instrument cluster

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