7-Pin to 4-Pin Trailer Plug Adapter

Manufacturer Number: 57004

$19.95

List Price: $26.79
You Save 26%

 Select Vehicle to Check Fitment

1 in Stock

Free Shipping Over $50

Also referred to as a 7-way to 4-way adapter, this allows you to connect the factory trailer hitch wiring used on your Mercedes, VW or BMW equipped with a 7-way or "RV" plug, to a simple 4-pin flat trailer plug. Enabled for LED lighting, preventing an "bulb out" error on the dash.

Read More...
  • Adapts a 7-way RV blade vehicle socket to fit 4-way or 5-way flat trailer plugs
  • Enables vehicles with a 7-way RV blade socket to recognize LED trailer lights
  • Built-in, integrated resistors for computers that don't recognize LED lights
  • 4-way flat output connects tail lights, brake lights and turn signals
  • 5-way flat adds connection for reverse lights
  • Simple plug-and-play design eliminates the need for cutting or splicin
You work hard and play hard. CURT hitches, trailer wiring and towing accessories are tested for adventure to help you do more of what you love.
Audi
  • A3 TDI (8P) w/ 2.0L CBEA Engine (2009-2014)
  • A3 TDI (8V) w/ 2.0L CRUA Engine (2015)
  • A6 TDI (C7) w/ 3.0L V6 CPNB Engine (2014-2016)
  • A7 TDI (C7) w/ 3.0L V6 CPNB Engine (2014-2016)
  • A8 TDI (D4) w/ 3.0L V6 CPNB Engine (2014-2015)
  • Q5 TDI w/ 3.0L V6 CPNB Engine (2014-2016)
  • Q7 TDI (4L) w/ 3.0L V6 CATA Engine (225HP) (2009-2012)
  • Q7 TDI (4L) w/ 3.0L V6 CNRB Engine (240HP) (2013-2015)
BMW
  • 328d (F30) w/ 2.0L N47 Engine (2014-2018)
  • 335d (E90) w/ 3.0L M57 Engine (2009-2011)
  • 524td w/ 2.4L Turbodiesel (1985)
  • 535d (F10) w/ 3.0L N57 Engine (2014-2017)
  • 540d (G10) w/ 3.0L N57 Engine (2018)
  • 740Ld (F01) w/ 3.0L N57 Engine (2015-2016)
  • X3d (F25) w/ 2.0L N47 Engine (2015-2016)
  • X5 xDrive35d (F15) w/ 3.0L N57 Engine (2014-2018)
  • X5d/xDrive35d (E70) w/ 3.0L M57 Engine (2009-2013)
Mercedes
  • 190D (W201) w/ 2.5L Turbo OM602.961 Engine (1987)
  • 190D (W201) w/ 2.2L 601.921 Engine (1984-1985)
  • 190D (W201) w/ 2.5L OM602.911 Engine (1986-1989)
  • 240D Non-Turbo (W123) w/ 616.912 Engine (1977-1983)
  • 300D 2.5 Turbo (W124) w/ 602.962 Engine (1990-1993)
  • 300D Non-Turbo (W123) w/ 617.912 Engine (1977-1981)
  • 300D Turbo (W123) w/ 617.952 Engine (1982-1985)
  • 300D Turbo (W124) w/ 603.960 Engine (1987)
  • 300SD Turbo (W126) w/ 617.951 Engine (1981-1985)
  • 300SD/S350 (W140) w/ 603.971 Engine (1992-1995)
  • 300SD/SDL Turbo (W126) w/ 603.961 Engine (1986-1987)
  • 350SD/SDL Turbo (W126) w/ 603.970 Engine (1990-1991)
  • E 250 BlueTEC (W212) w/ 2.1L OM651 Engine (2014-2016)
  • E 300 Diesel (W124) w/ 3.0L OM606 Engine (1995)
  • E 300D (W210) w/ 606.912 Engine (1996-1997)
  • E 300D (W210) w/ Turbo 606.962 Engine (1998-1999)
  • E 320 BlueTEC (W211) w/ 3.0L OM642 Engine (2007-2009)
  • E 320 CDI (W211) w/ 3.2L OM648 Engine (2004-2006)
  • E 350 BlueTEC (W212) w/ 3.0L OM642 Engine (2011-2013)
  • GL 320 BlueTEC (X164) w/ 3.0L OM642.820 Engine (2009)
  • GL 320 CDI (X164) w/ 3.0L OM642.820 Engine (2007-2008)
  • GL 350 BlueTEC (X164) w/ 3.0L OM642.820 Engine (2010-2012)
  • GL 350 BlueTEC (X166) w/ 3.0L OM642.826 Engine (2013-2015)
  • GLE 300d (W166) w/ 2.1L OM651 Engine (2016)
  • GLK 250 (X204) BlueTEC w/ 2.1L OM651 Engine (2013-2015)
  • GLS 350d (X166) w/ 3.0L OM642.826 Engine (2016)
  • ML 250 BlueTEC (W166) w/ 2.1L OM651 Engine (2015)
  • ML 320 BlueTEC (W164) w/ 3.0L OM642.820 Engine (2009)
  • ML 320 CDI (W164) w/ 3.0L OM642.940 Engine (2007-2008)
  • ML 350 BlueTEC (W164) w/ 3.0L OM642.820 Engine (2010-2011)
  • ML 350 BlueTEC (W166) w/ 3.0L OM642.826 Engine (2012-2014)
  • R 320 BlueTEC (W251) w/ 3.0L OM642.870 Engine (2009)
  • R 320 CDI (W251) w/ 3.0L OM642.950 Engine (2007-2008)
  • R 350 BlueTEC (W251) w/ 3.0L OM642.870 Engine (2010-2012)
  • S 350 BlueTEC (W221) w/ 3.0L OM642 (2012)
Porsche
  • Cayenne Diesel w/ 240HP 3.0L V6 Turbodiesel (2013-2016)
Volkswagen
  • Touareg TDI (7L) w/ BKW V10 Engine (2004-2005)
  • Touareg TDI (7L) w/ BWF V10 Engine (2006-2008)
  • Touareg TDI (7L) w/ CATA 225HP 3.0L V6 (2009-2010)
  • Touareg TDI (7P) w/ CATA 225HP 3.0L V6 (2011-2012)
  • Touareg TDI (7P) w/ CNRB 240HP 3.0L V6 (2013-2016)

Frequently Asked Questions

Ask us a question

What our customers say...

Worked great to resolve the issues I had with a uhaul trailer where the U-Haul adapter did not work correctly, did research and found out you need the led specific adapter

Rated
Shop by Category