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How to Replace the Alternator in a Toyota Tundra

by Contributor

The Toyota Tundra uses an alternator to run electrical devices in your vehicle while the engine is running. A voltage regulator ensures that the voltage level remains constant and is usually part of the alternator assembly. You may need to replace the alternator if your battery continually runs down or your headlights become dimmer while the engine is running.

Determine which alternator your Toyota Tundra will need. You'll want to be sure the new alternator is compatible with your Tundra's engine. Models built from 2000 to 2004 have a 3.4 L or 4.7 L engine. Models made from 2005 to 2006 offer options for a 4.0 L or 4.7 L engine. Starting in 2007, the Tundra is available with 4.0 L, 4.7 L and 5.7 L engines.

Disconnect the negative battery cable with a socket wrench. Remove the gravel shield if you need to access the alternator from under the car. Remove the electrical connector and unfasten the retaining nut on the alternator terminal with a socket wrench. This will allow you to remove the battery terminal wire.

Unfasten the lock nut, pivot bolt and adjusting bolt on the alternator with a socket wrench. Remove the drive belt and take the alternator off the vehicle.

Install the new alternator assembly. Use a torque wrench to tighten the lock nut to 25 ft. lbs. and the pivot bolt to 38 ft. lbs. Attach the adjusting bolt.

Connect the electrical harness and battery terminal wire to the alternator and fasten the retaining nut to the alternator terminal with a socket wrench. Install the gravel shield if you removed it. Replace the drive belt and restore it to the proper tension. Reconnect the negative battery cable with a socket wrench.

Items you will need

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