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you have two bolts holding the alternator in the front.Unplug the wire harness and the undo the positive battery lead. Before you do this you must disconnect the positive battery cable.
To access the alternator from under the hood:
1. Detatch neg battery lead. (keeps the fan from operating!)
2. Unplug the 2 sensors from the air intake manifold.
3. Remove air intake manifold & short hose leading from it
4. Undo fasteners for fan shroud & remove it, being careful when working it free of the radiator hoses. A socket wrench with extension, knuckle, and 10mm socket will do the trick.
5. Now the alternator is (somewhat) accessible. Loosen the belt tensioner and undo the alternator bolts as in the above answer.
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