GMC Sierra 1500 alternator — 100 amp (opt KY4) price snapshot
- Low
- $35
- Average
- $80
- High
- $200
Trim-specific price guide
GMC Sierra 1500 Alternator — 100 amp (opt KY4) prices
Pricing for the 100 amp (opt KY4) variant of the GMC Sierra 1500 alternator, aggregated from 76 salvage yard listings across 3 model years.
SKWritten bySaurabh Kumar · Co-Founder & CTO
SK
Saurabh Kumar
Co-Founder & CTO, Part Price Guide
Built the pricing pipeline that collects and normalizes used OEM part listings from salvage yards and online marketplaces across the US.
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedOct 20, 2026AS
Ambika Sharma
Co-Founder & COO, Part Price Guide
12 years of project management and technical operations experience. Reviews price guides for sample size, fitment accuracy, and data freshness.
Price summary
A used GMC Sierra 1500 alternator (100 amp (opt KY4)) costs $35 to $200, with a median asking price of $74. Based on 76 priced salvage yard listings across the US, updated Oct 20, 2026. Prices exclude shipping, core charges, and installation.
Grade A (excellent)$75
Grade B (good)$74
USD
Condition comparison
Price by part grade
Grade AClean / low wear$45–$20032 listings
Grade BStandard used$49–$18426 listings
Grade XUngraded$35–$12018 listings
| Grade | Price range | Relative range | Listings |
|---|---|---|---|
| Grade AClean / low wear | $45–$200 | 32 | |
| Grade BStandard used | $49–$184 | 26 | |
| Grade XUngraded | $35–$120 | 18 |
Median by grade
Grade price comparison
Grade A$75
Grade B$74
Ungraded$50
Median asking price by seller-reported condition grade · $35–$200 overall range
Trim-specific context
How is the 100 amp (opt KY4) priced differently?
This pricing covers the 100 amp (opt KY4) variant of the GMC Sierra 1500 alternator, based on 76 priced listings across 3 model years (2016, 2017, 2018). Its $74 median is 36% below the GMC Sierra 1500 alternator overall median of $116.
Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.
Price by model year
What does a 100 amp (opt KY4) cost by year?
Other trims
Other GMC Sierra 1500 alternator variants
150 amp (opt KG4)
4 yrs$162$40 – $307170 amp (opt KW7)
6 yrs$165$40 – $311170 amp (opt KW7), ID 13536551
1 yr$86$50 – $311170 amp (opt KW7), ID 13539727
3 yrs$91$40 – $279170 amp (opt KW7), ID 13540926
3 yrs$127$50 – $249170 amp (opt KW7), ID 22949467
1 yr$110$35 – $268170 amp (opt KW7), ID 84143540
1 yr$135$45 – $249220 amp (opt KW5), ID 13527173
1 yr$100$49 – $303220 amp (opt KW5), ID 13529433
1 yr$81$45 – $395Common questions
GMC Sierra 1500 alternator (100 amp (opt KY4)) FAQ
How much is a used GMC Sierra 1500 alternator (100 amp (opt KY4))?
Based on 76 priced salvage-yard listings across 3 model years, a used GMC Sierra 1500 alternator in the 100 amp (opt KY4) variant lists between $35 and $200, with a median asking price of $74.
Which GMC Sierra 1500 years use the 100 amp (opt KY4) alternator?
The 100 amp (opt KY4) variant appears in model years 2016, 2017, 2018. Prices and availability differ by year.
Is there a price difference between 100 amp (opt KY4) condition grades?
Yes. Grade A has a median of $75, Grade B has a median of $74. Grade A parts are in excellent condition, B is good, and C is fair.