Easy InstallationTail Light: Stud mount, which means that it does not install flat against the surface of the trailer, and a hole is needed to be cut into the trailer for the light. This type of light is installed using a flange or bracket that has mounting holes. And mounting hardware is used to secure the light to the trailer.Side Marker Light: Anywhere you'd like to mount them by drilling two holes 3"" apart.Wire TipsTail Light:3 Wire ConnectionsWhite: Ground WireBlack: Tail LightRed: Brake and Turn SignalThe License Plate Light light up When Tail Lights are on.Side Marker Light:Black is the NegativeRed is the Positive***Wires come out at the lower corner, not the center***Package IncludesLED RV Camper Trailer Stop Turn Brake Tail Lights Clear Lens (Left+Right)5pcs x Red Trailer Clearance Lights