Conversion harness for 2013-2018 Ram radios. This harness will convert your RA1 or RA2 radio to the RA3, RA4, or 4c radio. It is needed to be able to connect the required module to the new radio bezel for your Climate control and other functions to work as they should. Available in factory 7 speed or for the 4 to 7 speed blower motor configurations. If you have the 4 speed blower motor, your order will contain both harnesses required. Control module and blower motor resistor is not included.