Hogtunes Rear Speaker Plug - Harley Davidson117778120 Product Description Allows easy access to factory radios with built in rear speaker outputs Plugs directly into empty 35 pin socket on 06 13 factory Harmon Kardon radios Wires are clearly labelled for easy installation Notes This plug accesses the speaker leads of the radio but does not activate your radio's built in fader control. To have your fader enables, you must go to a H D dealer and have your radio "reflashed."