Battery, alternator and starter
Alternator replacement: what it costs
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $220 | $520 |
| Labor: 1.3 to 2.5 hours × $125 to $175 an hour | $163 | $438 |
| Fees: shop supplies, disposal, diagnostics | $0 | $30 |
| Total, rounded | $380 | $990 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in Boston, $31.54 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
The alternator charges the battery while the engine runs. A failing one causes a battery light, dim lights, or a car that dies while driving.
What is usually included
- New or remanufactured alternator
- New serpentine belt if worn
- Test the battery and charging output
- Clean connections
- Test drive
What moves the price
- New alternator versus a rebuilt unit
- Hard-to-reach location on some engines
- Belt replaced at the same time
- Larger or high-output unit
Questions to ask before you say yes
- Did you confirm the alternator is the cause?
- Is the part new or remanufactured, and what's the warranty?
- Is the belt replaced?
- Was the battery tested too?
Can you do it yourself?
A moderate DIY; belt routing, tight access, and disconnecting the battery first matter.
Shopping for the part? Search car parts on eBay (affiliate link, disclosure). Make sure the part fits your car before buying.
Common questions
What are signs of a failing alternator?
A battery warning light, dimming headlights, a whining sound, or the car dying are common signs.
Can I just replace the battery?
If the alternator is bad, a new battery will drain again. A charging test tells you which part is failing.
How long does it take?
Most alternator swaps take 1 to 3 hours. Some engines bury the alternator behind other parts, which adds time and cost.
How much does alternator replacement cost?
A typical range in Boston is $380 to $990. That is an estimate from parts prices, labor hours and the local labor rate, not a quote.
Typical range in 10 metro areas
Only the labor rate changes between cities. Same parts, same hours.
| Area | Typical range, estimate |
|---|---|
| Boston area, Massachusetts | $380 to $990 |
| New York City area | $370 to $970 |
| Los Angeles area, California | $370 to $980 |
| Chicago area, Illinois | $360 to $940 |
| Houston area, Texas | $350 to $920 |
| Dallas-Fort Worth area, Texas | $350 to $920 |
| Phoenix area, Arizona | $360 to $930 |
| Atlanta area, Georgia | $360 to $940 |
| Miami area, Florida | $350 to $930 |
| Seattle area, Washington | $380 to $980 |