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V6 4Runner has a 14mm bolt on the top of the alternator and a 12mm bolt on the bottom of the alternator.

Loosen both of these bolts.

Look through the drivers side wheel well and you will see another 12mm bolt below the alternator. This is your tension adjustment bolt. Tighten or loosen as needed.

After proper tension is achieved tighten the upper and lower alternator mounting bolts you loosened earlier.

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Q: How do you tighten an alternator belt on a Toyota 4 Runner?
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