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Depends on what vehicle and where on the engine it is located. If you're lucky the alternater (like most vehicles)will be on the front of the engine. You have to loosen the belt that travels around the alternator by finding the idler pully or tension pully and loosening it. Once that is done you just disconnect the battery lead to the old alternator, unbolt the mount bolts and remove it. do the reverse to put the new one on. If you end up removing the belt there should be a belt diagram on the inside hood detailing the routing of the belt. It's a good idea to go to the local parts store to find a Chilton's or other manual for your make of car to find more detailed instructions for this project. Best case, this job will only take 30-40 minutes.

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Q: How long does it take to replace the alternator?
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