How long does it take to replace an alternator?
Sarah Duran
Updated on February 17, 2026
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.
How long does it take a mechanic to replace an alternator?
Replacing an alternator will take a professional about two hours. However, that doesn't mean your car will only be at the shop for two hours—there may be a wait before a mechanic can address your ride. Plus, if the shop needs to get parts delivered, it will take even longer.Is replacing alternator easy?
Replacing an alternator can cost you several hundred bucks at the local repair shop, but it's one of the simplest repairs you can do at home. With a few tools and about an hour you can swap it out yourself -- and keep your dough in your pocket where it belongs.How long does it take to replace an alternator at a dealership?
This is a common question with an easy answer. The make and model of your vehicle will determine the exact time it takes to replace the alternator, but usually, one to two hours is sufficient.Can an alternator be replaced same day?
The replacement of the alternator is a common repair, and will be provided by most shops. Most alternators will be replaced within the day, however plan on dropping the car off early and picking it up near the end of the day.AutoZone Car Care: When to Replace Your Alternator
Do you have to replace battery when replacing alternator?
Your battery should be one of the first things on your checklist after installing a new car alternator. Any installation guide will say that you need to disconnect the battery before installing the new alternator. So, at the very least, you need to make sure that you reconnect it.What causes an alternator to fail?
Alternators have a number of moving parts, so as they get dirty and are subjected to extreme temperatures, those internal components can wear out, causing the alternator to go bad. One of the most common problems you're likely to experience with an alternator is a failure in the bearings.Is replacing alternator worth it?
It's usually a better idea to replace the alternator entirely if it is malfunctioning. While new ones can be spendy, they are usually a better choice than remanufactured or rebuilt options. Those probably won't last as long as a new one since the mechanical parts have miles on them already.How much does it cost in labor to change an alternator?
The average time for an alternator replacement is two-to-three hours. That gives you roughly $120- $200 in labor to start.How much does a new alternator cost?
You can expect to pay anywhere from $400 to $1,500 for a new car alternator in Australia. The exact price will depend on the vehicle you drive and whether you're buying brand-new or used. The replacement will take at least 2 hours to install. Keep reading about what a car alternator does and when you should replace it.What else should be replaced when replacing alternator?
When replacing and alternator, other upgrades are worth doing too. Go ahead and change the serpentine belt, tensioner and idler roller when replacing an alternator on your car or truck.What are signs your alternator is going out?
Dim or Overly Bright LightsGenerally, that takes the form of under- or over-performing equipment, such as headlights that are either too dim or extremely bright. You may also experience flickering lights or lights that erratically go from bright to dim and vice-versa.