How to Replace Alternator 04-07 Toyota Highlander L4 2.4L
Difficulty: Advanced · About 120 min · Toyota Highlander
Replace the alternator on a 2004–2007 Toyota Highlander with the 2.4L engine by disconnecting the battery, releasing the belt tensioner, and restoring the belt routing.
Tools you will need
- 10mm socket
- 12mm socket
- 14mm socket
- 19mm socket
- Ratchet and extensions
- Breaker bar
- Flat blade screwdriver
Parts and supplies
- Alternator
Steps
Disconnect the battery and release the belt
Disconnect the negative battery terminal. Note the serpentine belt routing, rotate the tensioner with a breaker bar, and slip the belt off the alternator before easing the tensioner back.
Disconnect alternator wiring
Remove the protective boot and disconnect the alternator output cable and electrical plug. Release the harness retainers and move the wiring clear of the mounting bolts.
Remove the old alternator
Remove the alternator bracket fastener and its upper and lower mounting bolts. Carefully maneuver the alternator from the bracket without damaging nearby components.
Install the replacement alternator
Position the replacement and install its mounting bolts, tightening them to the vehicle's specification. Reconnect the electrical plug and output cable, refit the protective boot, and secure the harness retainers.
Reinstall the serpentine belt
Route the belt according to the underhood diagram. Rotate the tensioner, guide the belt over the alternator pulley, and slowly release the tensioner.
Reconnect and verify charging
Reconnect the negative battery cable and confirm the belt is seated in every pulley groove. Start the engine and check for warning lights, belt noise, or charging issues.
Check your vehicle’s repair manual for exact specifications and fit.