Symptoms of a Bad or Failing Alternator

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Cost of Replacing a Bad or Failing Alternator

Common signs include having to jump start the car frequently, dim lights when operating the vehicle, or the Battery Light coming on. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Alternator Repair. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2014 Nissan Cube $347 $269.68 $77.00 10% $387.93
2008 Mazda Tribute $350 $272.58 $77.00 10% $390.83
2014 Dodge Challenger $535 $429.58 $105.00 9% $590.83
2010 Acura CSX $358 $287.97 $70.00 9% $395.47
2009 Mercedes-Benz SLK300 $369 $278.18 $91.00 11% $417.93
2011 Jaguar XF $597 $457.18 $140.00 11% $672.18
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How to Diagnose a Bad or Failing Alternator?

bad alternator

The electrical charging system is one of the most important systems on any vehicle. The charging system is made up of several components, including the alternator and battery, that work together to supply all of the vehicle’s electrical needs. The alternator is what specifically generates the amperage and electricity required to meet the vehicle’s electrical needs, including keeping the battery charged.

Because the alternator plays such a vital role in keeping all of the vehicle’s electrical components powered, any problems with the alternator can quickly develop into problems with another system or component on the vehicle. Usually, a defective or failing alternator will produce a few symptoms that can alert the driver of a potential issue, allowing time for the driver to service the vehicle before a bigger problem occurs.

1. Having to jump start the vehicle on a regular basis

One of the first symptoms of a bad or failing alternator is the need to jump start the vehicle on a regular basis. It is the job of the battery to provide the power to crank the engine and start the vehicle, however, it is the job of the alternator to make sure that the battery stays charged. If the alternator is beginning to have problems or has failed, it will not be able to meet the vehicle’s electrical needs, including keeping the battery fully charged. A low or uncharged battery will not be able to keep up with the load required to start an engine multiple times, and will result in a dead battery. Continuously having to jump start the vehicle may be a sign that the alternator may not be charging the battery and is therefore unable to successfully start a vehicle.

2. Dim lights

Another symptom of a potential problem with the alternator is dim or flickering lights. If you notice any sort of flickering or dimming of the lights when operating the vehicle, it may be a sign that the alternator is not generating enough power to keep up with the vehicle’s electrical needs. The dimming or flickering may coincide with certain actions when operating the vehicle, such as dimming when pressing on the gas pedal, turning up the volume on the stereo, or turning on another light. This symptom may be indicative of an alternator that is unable to keep up with the needs of the vehicle’s electrical system while it is running, and when additional loads are placed on it.

3. Battery Light comes on

One of the most common symptoms of a problem with the alternator is an illuminated Battery Light. The Battery Light will usually come on when the computer detects that the system voltage has fallen below a certain requirement. This usually means that the alternator, or perhaps one of its internal components, has failed and it is no longer able to keep up with the vehicle’s electrical requirements, and it has been detected by the computer. An illuminated Battery Light also indicates that the vehicle is now running on limited battery life. Depending on the condition of the battery, and how long the Battery Light has been on, the vehicle should be able to run for a short amount of time before the battery finally dies. At that point, the vehicle will shut off and service will be required.

The alternator is among a vehicle’s most important components, as it essentially serves to provide the electrical supply for the entire vehicle. Any problems with it can quickly translate to problems with starting and running the vehicle, which opens up the possibility of being stranded on the road. If you suspect that your vehicle may be having a problem with the alternator, or it is displaying any of the symptoms above, [have the battery and alternator carefully inspected] by a professional technician, such as one from YourMechanic. They will be able to determine if an alternator replacement is necessary, or if another issue needs to be addressed.

electrical system
Charging System
alternators
Battery Light
Batteries

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Recent Alternator Repair reviews

Excellent Rating


YourMechanic Alternator Repair Service

Average Rating

4.9/5

Number of Reviews

3,862

Rating Summary
3,635
133
28
17
49
3,635
133
28
17
49

Brikk

15 years of experience
299 reviews
Brikk
15 years of experience
Despite the part delay, rescheduled appointment, obnoxious heat and a completely dead battery (none of which was at the fault of Brikk) Brikk was able to power through and get me and my G8 back on the street. Brikk gave me some oil lubricating tips for my over 150,000 mile ride. He trusted the information I provided about my alternator issues and was able to complete the job without any glitches as far as I know. 1st experience already referring... Thanks a bunch.
2009 PONTIAC G8 - ALTERNATOR - CHARLOTTE, NORTH CAROLINA

Shaun

7 years of experience
428 reviews
Shaun
7 years of experience
Great job, competent, did job in very little time, friendly guy and professional. Would recommend.
2006 TOYOTA 4RUNNER - ALTERNATOR - PHOENIX, ARIZONA

Nathan

14 years of experience
95 reviews
Nathan
14 years of experience
Nathan was very professional, he did wonderful work in a timely manner. I would definitely recommend him he is an experienced mechanic!!!
2005 CHEVROLET CORVETTE - ALTERNATOR - AUSTIN, TEXAS

Eduardo

19 years of experience
52 reviews
Eduardo
19 years of experience
He did a great job and pointed out a couple of things i will need to take care of in the future.
2009 VOLKSWAGEN JETTA - ALTERNATOR REPAIR - WILLIAMSBURG, VIRGINIA

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