How much does an alternator cost Subaru?

Replacing a Subaru alternator typically costs between roughly $120 and $700 for the part itself, with installed prices commonly ranging from about $400 to $900 depending on model, amperage, and labor. These numbers can vary by year, engine type, and regional labor rates.

What determines the price?

Cost varies by part type, model, and installation method; the following options are common.

• New OEM Subaru alternator (brand-new, from Subaru or approved suppliers): typically $350–$725 for the part before labor.


• Remanufactured/OEM-rebuilt alternator: usually $180–$420 for the part.


• Aftermarket new alternator (non-OEM brand): typically $120–$260 for the part.


• Used or salvage-taken alternator (takeout): often $60–$200 for the part.

These ranges reflect variations by model year, engine configuration, and where you buy the part. The amperage rating (for example, 100A, 120A, 140A, or higher) can also influence price and availability.

Labor and installation considerations

Labor costs can be a significant portion of the total bill, and where you have the work done matters.

• DIY replacement: No labor charge if you do it yourself, but you’ll need the right tools and mechanical know-how; typical time is 1–3 hours depending on the model.


• Independent mechanic or shop: Usually $70–$120 per hour; most Subaru alternator replacements take 1–3 hours, so total installed costs often fall in the $320–$800 range, depending on parts and local rates.


• Dealership: Higher hourly rates (often $100–$150+ per hour); total installed cost can reach $500–$1,000 or more, depending on model and region.


• Additional costs to consider: belt inspection or replacement (tensioner/belt may be advised), diagnostic fees, and any required brackets or hardware.

To avoid surprises, always request a written estimate that separates parts, labor, and any potential add-ons, and confirm warranty terms on the chosen part.

Model-specific considerations

Engine size and alternator amperage

Subaru models use different alternator amperages to match electrical demand. Higher-output units (for all-wheel-drive models or vehicles with many electrical accessories) cost more and may require compatible brackets or wiring harnesses.

OEM vs aftermarket and warranties

OEM new parts often include longer or more straightforward warranties; remanufactured OEM and aftermarket units can offer savings but may come with shorter or different warranty terms and returns policies. Always verify warranty coverage and understand what is covered if a replacement fails.

Additionally, climate, mileage, and typical driving patterns can influence how soon an alternator wears out, and some Subaru models with aging electrical systems may benefit from related components (belts, tensioners) being replaced during the same service.

Summary

The cost to replace a Subaru alternator varies widely based on part type, model/year, and how the work is performed. Expect roughly $120–$700 for the part and about $400–$900 installed in typical scenarios, with higher-end or dealership jobs exceeding that range. Compare OEM, remanufactured, and aftermarket options, get multiple quotes, and weigh warranties and labor costs. If you have the skills and the right tools, DIY can save money, but professional installation ensures proper fit and reliability.

How long do Subaru Alternators last?

Alternators generally last about 150k in my experience, however I've seen some go at 90k and some go at 300k so it's just a part that goes when it goes. I would never change one before it starts showing issues unless it's to get more amps.

How to tell if a Subaru alternator is bad?

How to Know If You're Subaru Alternator Is Failing

1. Dim Lights.
2. Dead Battery.
3. Whirring and Buzzing Noises from the Engine.
4. Unusual Electrical Bugs.
5. The Car Stalls.

What are the signs of a failing alternator?

Signs of a failing alternator include dim or flickering lights, a dead battery, strange noises like grinding or whining, and a burning smell. Other indicators are a battery warning light on the dashboard, slow or malfunctioning electrical accessories, and the engine stalling or having difficulty starting.
 
Visual signs

• Dim or flickering lights: Headlights, dashboard lights, and interior lights may appear dimmer than usual or flicker, especially as the engine speed changes. 
• Dashboard warning light: A warning light shaped like a battery (or labeled "ALT" or "GEN") will illuminate on the dashboard. 

Auditory signs 

• Strange noises: Listen for a grinding, whining, or squealing noise coming from the front of the car, which can indicate a worn bearing or a loose belt. 
• Engine stalling: The engine may suddenly stall or die, especially while driving or idling, due to insufficient electrical power. 

Olfactory signs

• Burning smell: A burning rubber or electrical smell can indicate that the alternator is overheating. 

Electrical and performance signs

• Dead or weak battery: The battery may repeatedly die and require jump-starts because the alternator isn't recharging it properly. 
• Malfunctioning accessories: Electrical components like power windows, the radio, or the air conditioning may slow down, work erratically, or stop working entirely. 
• Difficulty starting: The car may struggle to start or won't start at all, or the engine might start and then stall. 

Is it worth fixing an alternator?

Whether it's worth fixing an alternator depends on the extent of the damage; minor issues like a loose belt or worn-out brushes are often more cost-effective to repair, while severe damage makes replacement the better option. Fixing a minor problem can save money and prevent more expensive damage to other electrical components, but if the alternator is old or the damage is catastrophic, replacing it with a new or rebuilt unit is recommended. 
When to consider fixing it

• Minor issues: If the problem is simple, like a loose belt or a faulty diode, a repair is often a good idea. 
• Cost savings: A minor repair can be significantly cheaper than buying a new part and can prevent future, more costly problems from developing. 
• Relatively new part: If the alternator is not very old, it's more likely that a repair will be a worthwhile solution. 

When to consider replacing it

• Extensive damage: If the alternator has suffered catastrophic damage, such as a broken housing, replacement is the only viable option. 
• Old alternator: If the unit is old and nearing the end of its typical lifespan (80,000–150,000 miles or 7–10 years), replacing it with a new or rebuilt one is often more reliable in the long run. 
• Cost-effectiveness: Sometimes, even for non-catastrophic issues, replacing the entire unit can be more cost-effective than attempting a complex repair.