Replacement trailer wiring harness for vehicles originally equipped with a factory installed tow package – perfect for replacing or upgrading a damaged or missing factory harness. Quick and easy plug-in installation – no cutting or splicing necessary; Simply plug into the existing vehicle connectors and you are ready to start towing. Upgrades vehicles equipped with 4-flat factory wiring to a 7-way connector. Simple, easy to follow, do-it-yourself instructions, with photos, included in every package.