This is the needed harness for your 2009-2018 Ram truck when upgrading to the higher trim projector headlight assemblies. You are purchasing a pair of adapter harnesss. One for each headlight. NOTE - the 2 plugs that plug into the factory truck side harness are the same plug. So test operation of the headlights before putting everything back together. Turn signal and headlight plugs could be swapped mistakenly. ALSO NOTE - you are upgrading to projector headlights with LED turn signals, and possibly adding LED / HID bulbs. If one of the following is not done as well, you will experience a light out message on the dash, lights not working, lights shutting off, or hyper flash. You MUST -Use alfaobd to enable LED lights, and turn off error messages (this is my recommended route to take) -You can add inline diodes, or canBUS eliminators, but Ive seen that not fully fix the lights turning off.