Bay 12V / 05Form 12V-005
New vs Remanufactured vs OEM
Four part options, four price tiers, four reliability levels. The right choice depends on vehicle age, how long you plan to keep the car, and how much warranty matters to you. Below: cost and warranty side-by-side, brand-by-brand quality ratings, and the cases where reman is the smart choice or a bad idea.
Reman saving / vs new
$100 – $300
Reading verified at battery posts
Field 05a / Decision Card
Quick Recommendation
- Vehicle under 10 years old, plan to keep: new aftermarket from Denso, Bosch, or Motorcraft.
- Vehicle 10+ years or budget priority: remanufactured from Denso, Bosch, or ACDelco.
- In-warranty or certified pre-owned: new OEM at the dealer to preserve coverage.
- Beater car, selling soon: junkyard unit if available, accept the warranty risk.
- European luxury (BMW, Mercedes, Audi): OEM is the safe choice; aftermarket reliability is mixed.
Field 05b / Four Options
Four Options Side-by-Side
| Option | Price | Warranty | Lifespan | Best For |
|---|---|---|---|---|
| New OEM | $300 – $700 | 2 – 3 yr | Same as factory original | In-warranty vehicles, premium owners |
| New Aftermarket | $150 – $400 | 1 – 3 yr | Equivalent to factory | Most owners, best value |
| Remanufactured | $100 – $300 | 1 – 3 yr* | About 90% of new | Older vehicles, budget priority |
| Used / Junkyard | $50 – $150 | 30 – 90 day | Unknown, often short | Beater cars, temporary fix |
* Reman warranty period varies more than any other option. Read the specific terms before buying.
Field 05c / Brands
Brand-by-Brand Quality
| Brand | New $ | Reman $ | Warranty | Tier | Notes |
|---|---|---|---|---|---|
| Denso | $220 – $620 | $130 – $310 | 2 – 3 yr | Top-tier | Toyota, Honda, Subaru OEM supplier |
| Bosch | $240 – $680 | $140 – $340 | 2 – 3 yr | Top-tier | European OEM, very reliable |
| ACDelco | $200 – $560 | $120 – $300 | 1 – 2 yr | Strong | GM OEM; excellent on Chevy/GMC |
| Motorcraft | $220 – $590 | $130 – $310 | 2 yr | Strong | Ford OEM |
| Valeo | $220 – $640 | $130 – $320 | 2 yr | Strong | Audi/VW OEM |
| Mitsubishi | $210 – $580 | $120 – $300 | 2 yr | Solid | Japanese OEM (Mitsu, Nissan) |
| Remy | $160 – $420 | $110 – $260 | 1 – 2 yr | Mid-tier | Mass-market reman supplier |
| TYC | $130 – $360 | $90 – $230 | 1 yr | Budget | Cheap; expect shorter life |
| Duralast (AutoZone) | n/a | $110 – $280 | Lifetime to original buyer | Mid-tier | Easy returns; quality varies by SKU |
Field 05d / Reman
The Remanufacturing Process
What Gets Replaced
New bearings, new brushes, new voltage regulator, new diode pack (rectifier), often new slip rings. The wear-prone consumables are all swapped.
What Gets Reused
Aluminium housing, rotor core (with new windings if needed), stator. The structural and magnetic parts are tested and reused if within spec.
Why Quality Varies
Reman is only as good as the rebuilder. A reputable Denso or Bosch reman is held to factory spec; a no-name reman might use bargain bearings and skip the diode-pack swap.
When Reman Is a Bad Idea
Water-cooled alternators (harder to seal correctly), very high-output units (heat margins matter), and vehicles you plan to keep 5+ more years.
Field 05e / Warranty
Warranty Reference
| Option | Period | Covers | Where to Claim |
|---|---|---|---|
| New OEM | 2 – 3 yr / unlimited mi | Parts only by default | Bring the part to the OEM dealer counter |
| New Aftermarket | 1 – 3 yr (varies) | Parts only; some chains include labor for first year | Retailer where purchased |
| Remanufactured | 1 – 3 yr (varies widely) | Parts only; lifetime tier exists at chain stores | Retailer where purchased |
| Used / Junkyard | 30 – 90 day | Often parts only and very limited | Yard receipt; bring the failed unit |
Full warranty terms (parts vs labor, factory coverage, credit-card extensions): see warranty reference.
Field 05f / Junkyard
The Junkyard Alternator Debate
A used alternator from a self-service yard is $50 to $100, but you are buying someone else worn unit with no service history. Reasonable when: a beater car you plan to scrap within a year, you can return it within 30 days, and you can get the donor vehicle’s mileage from the yard intake card. Unreasonable when: daily driver, family vehicle, or anywhere reliability matters. The $200 saved over a quality reman is the wrong economy.
Cross-Reference / 12V
Related Pages in This Register
Cost Estimator
Combine part choice with shop type.
Open page →
Warranty Reference
Full warranty terms.
Open page →
Cost by Vehicle
Part choice times your vehicle.
Open page →
10 Ways to Save
Reman is one of the top strategies.
Open page →
Alternator Rebuild Cost
Bench rebuild and DIY kit vs a reman exchange.
Open page →
Disclaimer / This site provides general cost estimates for informational purposes only. We are not affiliated with any auto repair shop, parts manufacturer, or warranty provider. Always get multiple quotes for your specific vehicle.