Wiring harness, trailer, heavy duty

Years 1984–90, 1998–10, 2014–16, 2018, 2022–27 Models 12 Factory citations 65

Also described as Wiring harness, truck trailer, heavy dutyWiring harness, heavy duty, trailer, seven wireWiring harness, trailer, heavy-dutyWiring harness, truck trailer, heavy-duty

Also documented for Buick Cadillac Chevrolet Hummer Oldsmobile

Documented applications

Canyon — GMT355 (2004–2012)

2007–2009 Factory-verified

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

Envoy — GMT360 (2002–2009)

2004–2009 Factory-verified

GM factory document — 2004 gmc envoy 2wd rpo code list, p.1.
GM factory document — 2005 gmc envoy 2wd rpo code list, p.1.
GM factory document — 2009 gmc envoy 4wd rpo code list, p.1.

Jimmy (full-size) — Square body (1983–1991)

1984, 1985, 1990 Single-source

7 lead; included with Z82; the 1983 and 1986 option lines print UYT, and the 1986 and 1991 books otherwise name UY7 only in the Z82 contents, so 1983, 1986 and 1991 are left out (the Chevrolet K5 Blazer doc claims 1986 and 1991 from the Z82 contents); 1984 rests on the Chevrolet-only 1984 order guide pages (the joint price page prints UYT and names UY7 otherwise only in the Z82 contents), so the row is single-source; shared square-body platform code; cited from the Chevrolet Blazer kit

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 — 1990 Chevrolet Blazer, p.15.

Jimmy — second generation (1995–2001)

1998–2001 Factory-verified

GM factory document — 1998 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2000 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Safari — Second generation (1995–2005)

1998–2001, 2004, 2005 Factory-verified

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

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

Savana — GMT600 (1996–2002)

1998–2002 Factory-verified

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

Savana — 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 TG33503 (2025–2026), Cutaway TG33803 (2025–2026), Passenger 1LS, Passenger 1LT; not offered: Cutaway TG33903 (2025–2026)

GM factory document — 2003 gmc savana rpo code list, p.1.
GM factory document — 2008 gmc savana rpo code list, p.1.
GM factory document — 2008 chevrolet ld electricalfullsizevans, p.18.
GM factory document — 2009 gmc savana rpo code list, p.1.
GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.16.
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 — 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 — 2025 chevrolet my25 express savana electrical bbm, p.13.
GM factory document — 2025 gmc savana cargo fleet order guide, p.32.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.41.
GM factory document — 2025 gmc savana passenger fleet order guide, p.24.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.13.
GM factory document — 2026 gmc savana cargo fleet order guide, p.35.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.45.
GM factory document — 2026 gmc savana passenger fleet order guide, p.26.
GM factory document — 2027 gmc savana cargo fleet order guide, p.31.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.22.
GM factory document — 2027 gmc savana passenger fleet order guide, p.24.

Sierra — GMT800 (1999–2007)

1999–2002 Factory-verified

GM factory document — 1999 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2002 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2001–2002 Factory-verified

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2002 gmc gmc c sierra 2wd rpo code list, p.1.

Sonoma — second generation (1994–2004)

1998–2004 Factory-verified

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

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; shared square-body platform code; cited from the Chevrolet Suburban kit

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.

Yukon — GMT800 (2000–2006)

2000–2002 Factory-verified

GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2001 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2002 gmc yukon 2wd rpo code list, p.1.

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