How to Replace the Alternator in a Toyota Highlander
- 1). Determine which alternator your Toyota Highlander will need. You'll want to be sure the new alternator is compatible with your Highlander's engine. Models made before 2008 may have a 2.4 L, 3.0 L or 3.3L engine. The current version has a 3.5 L 2GR-FE engine.
- 2). Disconnect the negative battery cable with a socket wrench. Remove the electrical connector and the retaining nut on the alternator terminal with a socket wrench. This will allow you to remove the battery terminal wire on the alternator.
- 3). Unfasten the pivot bolt and plate washer, and adjust the lock bolt from the alternator with a socket wrench. Remove the drive belt and take the alternator off the vehicle.
- 4). Install the new alternator assembly. Replace the drive belt and adjust the tension to 170 to 180 lbs. for a new belt and 95 to 135 lbs. for a used belt. Use a torque wrench to tighten the adjusting lock bolt to 13 foot pounds. Install the plate washer and torque the pivot bolt the 41 foot pounds for a 3.0 L engine and 43 foot pounds for a 3.3 L engine.
- 5). Connect the electrical harness and battery terminal wire to the alternator and fasten the retaining nut to the alternator terminal with a socket wrench. Reconnect the negative battery cable with a socket wrench.
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