High brake light not working

First I put a new bulb in and cleaned the contacts, nothing. A friend checked for power and found none. He said my Haynes manual schematic showed a connector in the lower left rear door area was the next place that needed to be checked, I can't find that connector. As you may have guessed, I am not a mechanic but I'd like to try to fix this myself. The rest of the brake lights all work properly. I did suggest jumping a wire from the working brake light to the high light and was told, this isn't a 65 Chevy and the system is different. I love my 850 and try to keep it as best I can so any help would be appreciated, Thank You