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Starting and Charging Alternator Replacement

Toyota 4Runner Alternator Replacement

An alternator generates electric power in a car and is a major component of the car's charging system. Replacement costs depend on the year, make, and model of the car.

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Toyota 4Runner Alternator Replacement

RepairSmith offers upfront and competitive pricing. The average cost for Toyota 4Runner Alternator Replacement is $379. Drop it off at our shop and pick it up a few hours later, or save time and have our Delivery mechanics come to you.

Quoted to
2014 Toyota 4Runner 4.0L V6
60,000 miles
Keith C  • 
August 30, 2020 10:28 PM  • 
Las Vegas NV 89113
2.00  hrs
1.50  hrs
1999 Toyota 4Runner 3.4L V6
170,000 miles
Lynn G  • 
August 18, 2020 6:15 PM  • 
El Cajon CA 92019
5.20  hrs
1.00  hrs
1985 Toyota 4Runner 2.4L L4
300,000 miles
James f H  • 
August 4, 2020 2:39 PM  • 
Clovis CA 93611
5.70  hrs
1.70  hrs
2000 Toyota 4Runner 2.7L L4 Base
300,000 miles
Brandon M  • 
July 27, 2020 10:34 PM  • 
Phoenix AZ 85009
5.00  hrs
1.20  hrs
1996 Toyota 4Runner 2.7L L4
225,000 miles
Michael R  • 
July 15, 2020 2:57 AM  • 
Carlsbad CA 92008
4.80  hrs
1.60  hrs
1992 Toyota 4Runner 3.0L V6
117,919 miles
Alfonso R  • 
June 11, 2020 9:45 AM  • 
Las Vegas NV 89118
4.60  hrs
1.00  hrs
2010 Toyota 4Runner 2.7L L4
163,000 miles
Edgar D  • 
June 7, 2020 1:14 AM  • 
San Clemente CA 92673
5.80  hrs
1.30  hrs
1990 Toyota 4Runner 3.0L V6 SR5
155,067 miles
Eric P  • 
May 18, 2020 9:00 AM  • 
Santee CA 92071
1.50  hrs
1.50  hrs
1997 Toyota 4Runner 3.4L V6
370,000 miles
Julie H  • 
May 12, 2020 10:01 PM  • 
Sacramento CA 95816
2.10  hrs
1.30  hrs
1998 Toyota 4Runner 2.7L L4
200,000 miles
Robyn G  • 
May 6, 2020 10:00 AM  • 
Coronado CA 92118
1.70  hrs
1.20  hrs
2000 Toyota 4Runner
300,000 miles
Gloria P  • 
April 15, 2020 7:09 PM  • 
Phoenix AZ 85033
4.40  hrs
1.20  hrs
1997 Toyota 4Runner 2.7L L4
259,236 miles
Sally S  • 
March 9, 2020 2:00 PM  • 
Montebello CA 90640
1.80  hrs
1.20  hrs
1998 Toyota 4Runner 3.4L V6
240 miles
Jason T  • 
January 30, 2020 11:00 AM  • 
Pomona CA 91768
3.80  hrs
0.90  hrs
2001 Toyota 4Runner SR5
164,000 miles
Miguel P  • 
August 16, 2019 11:41 PM  • 
Beaumont CA 92223
2.60  hrs
0.80  hrs
1997 Toyota 4Runner Limited
250,000 miles
Tony S  • 
July 20, 2019 2:40 AM  • 
Oceanside CA 92054
5.10  hrs
1.30  hrs
2002 Toyota 4Runner SR5
216,000 miles
Lkjsd L  • 
June 3, 2019 3:00 PM  • 
Aliso Viejo CA 92656
1.10  hrs
1.00  hrs
1998 Toyota 4Runner 3.4L V6
160,000 miles
Brennan H  • 
Buena Park CA 90620
1.20  hrs
1.00  hrs
Last Updated:
Sep 11, 2020 3:48 PM
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What is an Alternator?

The alternator is responsible for two things. First, it powers the electrical units when your car is running. The radio, lights, window switches, USB ports, etc., are all powered by the alternator. And second, it recharges the car’s battery, which is the source of electricity when the car is turned off.

Your car’s alternator gains power from the engine. It’s connected to the engine via a drive belt, and it converts that energy into usable electricity.

It’s a pretty simple system. However, the alternator does need to be regulated, to make sure that nothing is overcharged or undercharged. In older cars, that’s the job of the voltage regulator. In newer cars, the engine control module (ECM) is responsible for those duties.

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Symptoms of a failing Alternator

Car won’t start

When your car is running, the alternator uses energy from the engine to recharge the battery. When the car is off, it needs that electricity from the battery in order to turn back on. If the car won’t turn on, it may be because the alternator isn’t recharging the battery.

Hard starting

Similarly, if the alternator isn’t charging the battery sufficiently, you’ll likely have trouble starting the car, also known as a hard start.


You might think that these issues only arise when starting the vehicle, but a malfunctioning alternator can actually result in stalling when your car is turned on.

Lights that are too bright or too dim

If the alternator is sending too much electricity to the electrical units, your car’s lights will likely be brighter than they’re supposed to be. Conversely, if the alternator isn’t sending enough electricity, then the lights will be too dim.

Whining noise

A busted alternator will often make an annoying whining noise when the engine is running.

Warning lights

A malfunctioning alternator will usually result in a warning light or two illuminating on your dashboard. The check engine warning light and a charging system warning light are most common.

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How urgent is an Alternator replacement?

Usually a faulty alternator won’t cause further damage to the vehicle. However, if it is overcharging or undercharging certain electrical units, it is possible for some damage to occur. A malfunctioning alternator does make your car less reliable, however, due to the potential issues with stalling and starting, so it’s best to get it replaced immediately if you’re starting to notice the above symptoms.

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