How to tell if a Subaru alternator is bad?
If your Subaru's battery is not charging properly or the electrical system is acting up, it could be a sign of a failing alternator. Identifying a bad alternator early can help prevent further damage to your vehicle's electrical components. Here's how to tell if a Subaru alternator is bad.
Signs of a Bad Subaru Alternator
- Battery not charging: If your battery isn't holding a charge or the voltage is low, it could indicate an alternator issue.
- Dimming headlights: Flickering or dimming headlights while the engine is running may mean the alternator is not providing enough voltage.li>
- Battery warning light: If the battery or charging system warning light on your dashboard is illuminated, it's a sign the alternator may be failing.
- Electrical issues: Problems with your Subaru's electrical components like the radio, lights, or dashboard displays could point to an alternator problem.
If you notice any of these symptoms, it's a good idea to have your Subaru's alternator tested by a mechanic as soon as possible.
Testing the Alternator
To confirm if the alternator is bad, a mechanic will typically perform a few tests:
- Voltage test: They'll check the voltage output of the alternator while the engine is running to ensure it's within the proper range.
- Load test: The mechanic will apply a load to the alternator to see if it can maintain the correct voltage under stress.
- Ripple test: This checks for alternator diode failure by measuring the alternator's AC voltage.
If the alternator fails any of these tests, it will likely need to be replaced.
Replacing a Subaru Alternator
Replacing a Subaru alternator is a job best left to a professional mechanic, as it involves removing and reinstalling the alternator, as well as properly connecting all the electrical wiring. The cost of a new alternator can range from $300 to $500, plus labor. Catching a failing alternator early can help prevent more expensive electrical system damage down the road.
Can AutoZone test an alternator?
Getting your alternator tested at AutoZone is simple and hassle-free. An AutoZoner can test your alternator while its still in your vehicle, saving you the hassle of removing it and re-installing it if it's still good. Or, if you have the alternator out of your vehicle already, we can test it on the bench instead.
How does a vehicle act when the alternator is going out?
And interior lighting if the lights brighten as rpms. Increase that is a telltale sign of a failing alternator.
How can I test my alternator?
Use a multimeter to test the voltage coming directly from the alternator with the engine off and running. To do this, attach the red probe to the output terminal on the back of the alternator and the black probe to the ground. With the engine off, you should get a reading around 12 volts.
What are the first signs of an alternator going bad?
Some warning signs of a failing alternator include:
- Trouble starting your car.
- Frequent stalling.
- Whining or screeching noise after the vehicle starts.
- Dim or overly bright lights.
- Smell of burning rubber or wires.
- Dead battery.
- Battery dashboard warning light is on.
How do I know if I need to replace my alternator?
7 Common Signs Your Vehicle Needs an Alternator Repair
- Starting Problems or Frequent Stalling.
- Warning Light Illuminates.
- Headlights Are Either Too Faint or Too Bright.
- Poorly Charged Car Battery.
- Burning Smell.
- Electronic Features Malfunction.
- Growling Sounds.
How long do Subaru alternators last?
How Long Do Subaru Alternators Last? Subaru alternators typically last around seven years or more, often exceeding 100,000 miles.
How do I know if my Subaru alternator is bad?
The Car Stalls
When you're driving and all of a sudden your engine stalls, it's likely that there's a problem with your alternator. This is because when your alternator fails, it cuts off power to some of your car's systems, including those that keep your engine running smoothly.
How do I know if I need a new alternator or battery?
One of the most obvious signs is if the car dies after a jump start. The alternator should provide enough current to keep the vehicle running even with a bad battery. If it doesn't, then your alternator needs to be examined.
How much does an alternator cost Subaru?
The average cost for alternator replacement is $747 to $842.
Will a bad alternator cause rough idle?
Yes, a bad alternator can indeed cause a rough idle.
