Shop Nilight 4 Pin Trailer Wiring Harness 55540 Vehicle Side Custom for 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 15 16 17 18 19 20 21 22 23 24 Chevy Express GMC Savana in high quality. No cutting or splicing factory wire. Plug and play harness. This trailer wiring harness kit plugs into existing factory wiring on your vehicle and equips it with a standard, rear 4-pin trailer wiring connector for plugging in and towing a trailer.