Tekonsha 118243 7-Way Tow Harness Wiring Package 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 connector, insert the provided fuses and relays, and you are ready to start towing Upgrades vehicles equipped with 4-flat factory wiring to a 7-way connector; original 4-flat connector will not be functional after installation For use with vehicles originally equipped with a 4 pole harness only - will not work on vehicles factory equipped with a 7 pole harness Instructions are easy to follow and include detailed photos; backed by Tekonsha's 1 Year Limited Warranty