Costs vary by model and replacement type and reflect typical market prices as of 2024–2026: expect about $120–$420 for aftermarket or remanufactured units, $350–$700 for a new OEM alternator, with installed totals typically in the range of $400–$1,000 depending on model and regional labor rates.
The following report breaks down price ranges by model commonly available in 2008 Infiniti lineups (G35/G37, FX35, M35, QX56) and offers tips for shopping and installation to help owners plan a budget.
Model-specific price ranges
Prices depend on engine size and amperage as well as whether you buy OEM, remanufactured, or aftermarket parts. Here are typical ranges for common 2008 Infiniti models.
G35/G37 (3.5L V6)
What to expect for replacement parts in this model family.
- New OEM alternator: typically 350–650 USD, depending on amperage (often 90–130 amps in this era).
- Remanufactured OEM/rebuilt: commonly 120–250 USD, with a core charge often refunded on return.
- Aftermarket new: commonly 180–400 USD.
Note: Availability and prices vary by supplier; always verify compatibility with your exact year and engine configuration.
FX35 (3.5L V6, crossover/SUV)
FX-specific pricing mirrors the G35/G37 range but can shift with supplier and whether a high-output unit is needed.
- New OEM: roughly 360–700 USD.
- Remanufactured: roughly 130–260 USD (core charges may apply).
- Aftermarket new: roughly 190–420 USD.
Labor variations apply; in many markets total installed cost remains in the mid-range of these values unless a high-output unit is required.
M35 (3.5L V6)
Similar pricing pattern to other 3.5L Infiniti models.
- New OEM: about 350–650 USD.
- Remanufactured: about 120–250 USD (core often required).
- Aftermarket new: about 180–420 USD.
Always check the model year and engine options to confirm fitment.
QX56 (5.6L V8)
For Infiniti's full-size SUV with the larger engine, alternators tend to cost more.
- New OEM: commonly 420–850 USD.
- Remanufactured: roughly 150–300 USD (core may apply).
- Aftermarket new: about 200–450 USD.
Labor costs can be higher for larger engines due to accessibility and space constraints.
Shopping and installation tips
To keep costs predictable, follow these tips before purchasing or scheduling a replacement.
- Verify exact model, engine, and amperage requirement with your VIN or owner’s manual.
- Consider remanufactured units with a warranty of at least 1 year; beware of very low prices that may reflect limited warranties.
- Check whether the price includes core charge, shipping, recurring warranty, and return policy.
- Compare local shops and online retailers to find the best total installed price; factor labor rates into your region.
With the right part and a qualified technician, most 2008 Infiniti alternator replacements can be completed in 1–2 hours, depending on access and vehicle model.
Summary
For a 2008 Infiniti, the cost of replacing the alternator ranges from roughly 120–420 USD for the part itself (remanufactured or aftermarket) to 350–700 USD for a new OEM unit, with total installed costs typically around 400–1,000 USD depending on model, amperage, and labor. Always verify compatibility with your exact vehicle and shop around for the best overall price and warranty.