Replacing an Alternator
Save the memory on your vehicle’s preset electronics.
Disconnect the negative battery cable.
Loosen the belt tensioner.
Loosen and remove the serpentine belt.
Remove the wiring harness or connectors.
Loosen and remove the alternator.
Install the new alternator, making sure it fits and aligns with the bolt holes.
Put your replacement belt on.
Make sure the tension on the belt is correct.
Reconnect the negative battery cable.

How Long Does it Take to Change an Alternator?
In general, it will take about two hours for you to replace an alternator on your own, though this could vary somewhat depending on your knowledge of car mechanics. If you take your car into a shop in order to have the alternator replaced, timing may vary somewhat, and you may have to leave the car for the day.

What Tools are Needed to Change an Alternator?
You’ll need a number of different tools in order to install your new alternator, including:

New car alternator (of course!)
Belt tensioner
Basic hand tools
Voltmeter
Replacement serpentine belt
Rags
Gloves
How Much Does it Cost to Change an Alternator?
The cost to change your alternator varies depending on your car’s make, model, and year. On average, though, you can expect to spend around $200-300 for a new alternator. However, changing an alternator requires a bit of automotive knowledge. If you decide to take it in to be replaced by a professional technician, expect to pay around $100 or so for labor on top of the cost of the materials, for a total of roughly $300-400.

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