Trunk Light Wiring Question

I ordered a trunk light wiring assy. with the "T" style plug. it is complete including bulb and small metal Switch which would be like a small button mounted on the trunk to turn off/on the trunk light. My question is that I have looked everywhere in my trunk to see where to plug that "T" plug into my existing harness to power up the light and cannot locate anywhere in the harness to plug it in. I am not sure if my car had a trunk light when it was new but all the mounting points for what would appear to be a trunk light assembly are in place. If anyone out here can assist me in connecting up power to the light, I would be grateful for the assistance. Thanks in advance.:cheers: -maniac