Wiring harness, truck trailer, heavy duty

Years 1984–91, 1993, 1998–10, 2014–16, 2018, 2022–27 Models 16 Factory citations 98

Also described as Wiring harness, trailer, heavy dutyWiring harness, heavy duty, trailer, seven wireWiring harness, trailerWiring harness, trailer, heavy-dutyTrailering provisions, trailering wire harness only

Also documented for Buick Cadillac GMC Hummer Oldsmobile

Documented applications

Astro — Second generation (1995–2005)

1998–2001, 2004, 2005 Factory-verified

2004 and 2005 lists read "Truck Trailer Wiring Harnes, HD".

GM factory document — 1998 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2000 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet astro 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet astro 2wd rpo code list, p.1.

Avalanche — GMT800 (2002–2006)

2002 Factory-verified

GM factory document — 2002 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Avalanche, p.56.

Blazer (full-size, K5) — Square body (1983–1991)

1984–1986, 1990, 1991 Factory-verified

7 lead; included with Z82; the 1986 and 1991 option lines print UYT, so those years cite the pages that print UY7 only in the Z82 contents (the 1983 page prints UYT only, so 1983 is left out)

GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.5.
GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.11.
GM Heritage factory kit — 1986 Chevrolet Blazer, p.14.
GM Heritage factory kit — 1990 Chevrolet Blazer, p.15.
GM Heritage factory kit — 1991 Chevrolet Blazer, p.16.

Blazer — S-10 second generation (1995–2005)

1998–2005 Factory-verified

GM factory document — 1998 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 1999 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2000 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2001 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2002 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2003 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2004 chevrolet blazer 4wd rpo code list, p.1.
GM factory document — 2005 chevrolet blazer 4wd rpo code list, p.1.

Colorado — GMT355 (2004–2012)

2007–2009 Factory-verified

GM factory document — 2007 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet colorado pickup 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet colorado pickup 2wd rpo code list, p.1.

Express — GMT600 (1996–2002)

1998–2002 Factory-verified

GM factory document — 1998 chevrolet express rpo code list, p.1.
GM factory document — 1999 chevrolet express rpo code list, p.1.
GM factory document — 2000 chevrolet express rpo code list, p.1.
GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.

Express — GMT610 (2003–2027)

2003–2010, 2014–2016, 2018, 2022–2027 Factory-verified

the 2025–2027 guides read Trailering provisions, trailering wire harness only; O: Cargo 1WT, Cutaway 1WT (2027), Cutaway CG33503 (2025–2026), Cutaway 1WT and 2WT CG33803 (2025–2026), Passenger 1LS, Passenger 1LT; not offered: Cutaway 1WT and 2WT CG33903 (2025–2026)

GM factory document — 2003 chevrolet express rpo code list, p.1.
GM factory document — 2004 chevrolet express awd rpo code list, p.1.
GM factory document — 2005 chevrolet express awd rpo code list, p.1.
GM factory document — 2006 chevrolet express awd rpo code list, p.1.
GM factory document — 2007 chevrolet express awd rpo code list, p.1.
GM factory document — 2008 chevrolet express rpo code list, p.1.
GM factory document — 2009 chevrolet express rpo code list, p.1.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.16.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.8.
GM factory document — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.17.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.12.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.17.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.14.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.15.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.15.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.13.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.15.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.24.
GM factory document — 2025 chevrolet express passenger fleet order guide, p.12.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.13.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.16.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.25.
GM factory document — 2026 chevrolet express passenger fleet order guide, p.13.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.15.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.11.
GM factory document — 2027 chevrolet express passenger fleet order guide, p.12.

Lumina APV — U-body (1990–1996)

1993 Factory-verified

requires L27; included with the trailer package (the remark prints V32)

GM Heritage factory kit — 1993 Chevrolet LuminaAPV, p.41.

S-10 pickup — Second generation (1994–2004)

1998–2004 Factory-verified

GM factory document — 1998 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 1999 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2000 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2001 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2002 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2003 chevrolet s10 pickup 4wd rpo code list, p.1.
GM factory document — 2004 chevrolet s10 pickup 4wd rpo code list, p.1.

Silverado — GMT800 (1999–2007)

1999–2002 Factory-verified

GM factory document — 1999 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado, p.58.
GM Heritage factory kit — 2002 Chevrolet Silverado, p.47.

Silverado HD — GMT800 (2001–2007)

2001, 2002 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado HD, p.64.
GM Heritage factory kit — 2002 Chevrolet Silverado HD, p.43.

Silverado Medium Duty (GM515, 2019–2026)

2025–2026 Factory-verified

GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

Suburban — GMT800 (2000–2006)

2000–2002 Factory-verified

GM factory document — 2000 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Suburban, p.49.
GM Heritage factory kit — 2001 Chevrolet Suburban, p.53.
GM Heritage factory kit — 2002 Chevrolet Suburban, p.39.

Suburban — Square body (1983–1991)

1985–1990 Factory-verified

7 lead; included with Z82; 1986 from the October 1985 (1986 model year) price page in the 1985 kit file, as the 1986 book prints UYT; the 1983 and 1984 option lines print UYT and the 1984 pages otherwise name UY7 only as Z82 package content, so 1983 and 1984 are left out

GM Heritage factory kit — 1985 Chevrolet Suburban, p.19.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.55.
GM Heritage factory kit — 1987 Chevrolet Suburban, p.25.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.18.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.15.
GM Heritage factory kit — 1990 Chevrolet Suburban, p.18.

Tahoe — GMT800 (2000–2006)

2000–2002 Factory-verified

GM factory document — 2000 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Tahoe, p.49.
GM Heritage factory kit — 2001 Chevrolet Tahoe, p.46.
GM Heritage factory kit — 2002 Chevrolet Tahoe, p.32.

TrailBlazer — GMT360 (2002–2009)

2003–2009 Factory-verified

GM Heritage factory kit — 2003 Chevrolet Trailblazer, p.114.
GM factory document — 2004 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet trailblazer 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet trailblazer 2wd rpo code list, p.1.

This page aggregates every documented appearance of UY7 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.