The typical cost ranges from about $100 to $350 for a rebuilt or aftermarket unit, and $350 to $600 for a new OEM replacement from a dealer, not including labor. Prices vary by brand, amperage, and whether a core charge applies. Labor, taxes, and shipping can add to total.
This article explains current pricing trends, the factors that influence cost, and practical shopping tips to help you find the right alternator for your 2003 Eclipse and avoid overpaying.
What determines the price
Consider the engine type (2.4L or V6), amperage rating, and whether the part is new OEM, remanufactured, or used. These choices drive price and performance.
- New OEM replacement from a dealer: typically $350–$600, depending on vehicle and region; sometimes higher for a genuine Mitsubishi part with a longer warranty.
- Remanufactured aftermarket alternators: generally $100–$250, often including a warranty; core charge may apply if you return your old unit.
- Aftermarket brand-new units (non-OEM): commonly $120–$400, with wide variation by brand, amperage, and supplier.
- Used or salvaged units: can be as low as $50–$150, but risk shortened lifespan and lack of warranty.
Prices can vary by retailer, location, and availability. Always verify compatibility with your Eclipse’s engine and electrical system before purchase.
What to verify before buying
Check amperage rating, compatibility with the 2003 Eclipse engine, pulley configuration, mounting points, and whether the unit includes a warranty. Also confirm core policy and shipping costs if ordering online.
Where to shop and how to save
Shopping around and considering refurbished options or core exchanges is a common way to save on replacement parts.
- Local auto parts stores (AutoZone, O'Reilly, NAPA) offer in-store pickup and warranties; prices vary by location.
- Online retailers (RockAuto, PartsGeek, Amazon) for price comparisons and broader availability; watch for shipping costs and return policies.
- Car-part yards or salvage shops may carry engines and alternators for older models with lower upfront costs.
Tip: Always confirm part compatibility with your specific Eclipse variant (engine size and VIN) and consider professional installation if you’re not comfortable performing the replacement yourself.
What to expect during replacement
Replacement typically takes 1–2 hours for a DIY job, more if you’re not experienced or need to address related issues like belt wear or warning light problems. Professional installation can add labor charges of roughly $80–$150 per hour depending on local labor rates, sometimes less if part of a broader service.
Summary: For a 2003 Mitsubishi Eclipse, budget roughly $100–$350 for a remanufactured or aftermarket alternator, $350–$600 for a dealer-supplied OEM unit, and plan for labor if you hire a shop. Verify amperage, mounting, and warranty, and compare multiple retailers to find the best price.