This procedure covers the removal and replacement of the alternator on a 2012-2017 Toyota Camry with the 2.5L I4 engine, including serpentine belt removal and electrical connections.

Warnings

Tools required

Parts

• Alternator × 1 — Use OEM specification or quality aftermarket (110A-130A output)
• Serpentine belt (if worn or damaged) × 1 — Use OEM specification

Preparation

1. Ensure the engine is completely cold before beginning work
2. Park the vehicle on a level surface and engage the parking brake
3. Open the hood and secure it in the open position
4. Locate the alternator on the passenger side of the engine, below the air intake system
5. Take a photo or diagram of the serpentine belt routing for reference
6. Disconnect the negative battery terminal and wait at least 3 minutes before proceeding

Procedure

1. 1

   Disconnect the battery
   Using a 10mm wrench or socket, loosen and remove the negative battery terminal. Move the cable away from the battery post and secure it so it cannot make contact. Wait at least 3 minutes to allow electrical systems to discharge.
   Torque spec

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

   Remove the engine cover (if equipped)
   Some models have a plastic engine cover. If present, pull up firmly on the cover to release the retaining clips and set it aside.
3. 3

   Release serpentine belt tension
   Locate the spring-loaded belt tensioner on the front of the engine. Using a 17mm socket with breaker bar or serpentine belt tool, rotate the tensioner clockwise to release tension. Slide the belt off the alternator pulley first, then carefully release the tensioner. Remove the belt from the remaining pulleys and set aside.
4. 4

   Disconnect alternator electrical connections
   Locate the electrical connections on the rear of the alternator. Remove the rubber boot covering the B+ terminal. Using a 10mm socket, remove the nut securing the cable to the B+ terminal and carefully pull the cable off. Press the tab and disconnect the smaller plug connector from the alternator.
   ⚠Do not allow the B+ cable to contact ground or other metal components after disconnection.
5. 5

   Remove the alternator pivot bolt
   Locate the lower pivot bolt at the bottom of the alternator bracket. Using a 14mm socket with extension, remove the pivot bolt completely. Support the alternator with one hand as you remove this bolt.
   Torque spec

   Alternator Pivot Bolt25 Nm (18 lb-ft)
6. 6

   Remove the upper alternator mounting bolts
   Locate the upper mounting bolts securing the alternator to the engine block. Using a 14mm socket with extension, remove both mounting bolts. The alternator will now be free from the engine.
   Torque spec

   Alternator Mounting Bolts50 Nm (37 lb-ft)
7. 7

   Remove the alternator from the vehicle
   Carefully maneuver the alternator out of the engine bay. It may be necessary to angle it slightly to clear surrounding components. Place the old alternator on a clean work surface.
8. 8

   Prepare and install the new alternator
   Compare the new alternator to the old unit to ensure correct fitment, pulley alignment, and mounting points match. Transfer any brackets or spacers from the old alternator if necessary. Carefully position the new alternator into the mounting location, angling it to clear surrounding components.
9. 9

   Install upper alternator mounting bolts
   Insert and hand-tighten both upper mounting bolts to hold the alternator in position. Do not fully torque at this time to allow for final positioning.
   Torque spec

   Alternator Mounting Bolts50 Nm (37 lb-ft)
10. 10

    Install the pivot bolt
    Insert the lower pivot bolt through the alternator bracket and hand-tighten. Once all three bolts are started, torque the pivot bolt first to specification, then torque the upper mounting bolts to specification using a torque wrench.
    Torque spec

    Alternator Pivot Bolt25 Nm (18 lb-ft)

    Alternator Mounting Bolts50 Nm (37 lb-ft)
11. 11

    Reconnect alternator electrical connections
    Reconnect the smaller plug connector to the alternator until it clicks into place. Place the B+ cable terminal onto the B+ stud and install the nut. Torque the nut to specification using a 10mm socket and torque wrench. Reinstall the rubber boot over the B+ terminal.
12. 12

    Install the serpentine belt
    Following the routing diagram (or your reference photo), route the new or existing serpentine belt around all pulleys except the alternator pulley. Using a 17mm socket and breaker bar, rotate the tensioner clockwise and slip the belt onto the alternator pulley last. Carefully release the tensioner to apply proper tension. Verify the belt is properly seated in all pulley grooves.
13. 13

    Reconnect the battery
    Reconnect the negative battery cable to the negative battery terminal. Tighten the terminal bolt to specification using a 10mm socket and torque wrench. Ensure the connection is secure but do not overtighten.
    Torque spec

    Battery Terminal Bolts8 Nm (6 lb-ft)
14. 14

    Reinstall engine cover
    If an engine cover was removed, align it with the mounting points and press down firmly until all clips snap into place.

Reassembly

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

Verification

• Start the engine and verify the alternator operates quietly without unusual noises or belt squealing
• Check that the battery warning light on the instrument cluster illuminates briefly during startup, then turns off
• Using a multimeter, verify charging system voltage at the battery terminals reads 13.5-14.5 volts with the engine running at idle
• Turn on electrical accessories (headlights, climate control, radio) and verify voltage remains stable
• Inspect the serpentine belt while the engine is running to ensure proper tracking on all pulleys with no slipping or misalignment
• Allow the engine to run for 5 minutes, then shut off and check for any fluid leaks or loose connections
• Test drive the vehicle and monitor the battery warning light to ensure it does not illuminate during operation

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