Reverse Lights

[subzero]

Does anyone know which wire I would want to tap into in order to have a 12v remote wire for my 12v relay only when the reverse lights are on. I have removed the plastic cover inside the trunk right next to the tail light. I have located the wire harness that runs into the tail light. It has 5 different wires. Does anyone know which color is for the backup light?
PS This is for a backup camera install

 

[tarheeltp17]

red with a yellow stripe... this wire is found left of the fuses in a 16 pin plug .