Used 2018 GMC Sierra 1500 alternator – 170 amp (opt KW7)

Year & trim-specific price guide

Used 2018 GMC Sierra 1500 Alternator — 170 amp (opt KW7) prices

Trim-specific pricing for the 170 amp (opt KW7) variant of the 2018 GMC Sierra 1500 alternator, built from 49 real salvage yard listings with condition grade detail.
SKWritten bySaurabh Kumar · Co-Founder & CTO
ASReviewed byAmbika Sharma · Co-Founder & COO
Last updatedOct 20, 2026

2018 GMC Sierra 1500 · 170 amp (opt KW7)

$137

median asking price

49 priced listings · $45–$268

Price summary

A used 2018 GMC Sierra 1500 alternator (170 amp (opt KW7)) costs $45 to $268, with a median asking price of $137. Based on 49 priced salvage yard listings across the US, updated Oct 20, 2026. Prices exclude shipping, core charges, and installation.

Grade A (excellent)$122
Grade B (good)$162

2018 GMC Sierra 1500 alternator — 170 amp (opt KW7) price snapshot

USD
Low
$45
Average
$141
High
$268
49 priced listings used · last updated Oct 20, 2026· How we price·

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Reporting price for 2018 GMC Sierra 1500 Alternator (170 amp (opt KW7))

Reason

Condition comparison

Price by part grade

Grade AClean / low wear$45–$24922 listings
Grade BStandard used$50–$26827 listings

Median by grade

Grade price comparison

Median asking price by seller-reported condition grade · $45–$268 overall range

Trim-specific context

How does the 170 amp (opt KW7) compare?

This pricing covers the 170 amp (opt KW7) variant of the 2018 GMC Sierra 1500 alternator, based on 49 priced listings. Its $137 median is 13% below the 2018 GMC Sierra 1500 alternator overall median of $157.

There are 2 other alternator variants available for the 2018 GMC Sierra 1500.

Pricing is not a fitment guarantee. Match the VIN, part number, engine or drivetrain, and seller-listed variant before ordering.

Same trim, other years

170 amp (opt KW7) in other model years

All years
202549 listings$165$50 – $249202150 listings$169$50 – $249202042 listings$86$50 – $311201648 listings$191$50 – $288201538 listings$86$40 – $310

Same year, other trims

What other 2018 GMC Sierra 1500 alternator variants are available?

150 amp (opt KG4)

49 listings$162$56 – $216

100 amp (opt KY4)

35 listings$71$35 – $200

Back to full guide

2018 GMC Sierra 1500 alternator — all trims

View 2018 guide

Common questions

2018 GMC Sierra 1500 alternator (170 amp (opt KW7)) FAQ

How much is a used 2018 GMC Sierra 1500 alternator (170 amp (opt KW7))?

Based on 49 priced salvage-yard listings, a used 2018 GMC Sierra 1500 alternator in the 170 amp (opt KW7) variant lists between $45 and $268, with a median asking price of $137.

Which years use the 170 amp (opt KW7) alternator?

The 170 amp (opt KW7) variant appears in model years 2015, 2016, 2018, 2020, 2021, 2025. Prices and availability may differ by year.

2018 GMC Sierra 1500 Alternator · 170 amp (opt KW7) Prices | Part Price Guide