I used the Autoharnesshouse harness and the reverse trigger wire for my backup camera. Read through this post.
http://www.ft86club.com/forums/showp...5&postcount=20
I attached the camera ground wire to the one of the amp bolts in the trunk.
How did you connect the red power wire from the harness relay to the camera's red power wire, solder, butt connector? I used a posi-lock connector. Good connection? I'm assuming you hooked up all the harness connections and the trigger wire correctly. Double check again.
Did you check the harness fuse for continuity? Is the fuse fully seated?
If everything is connected properly you could have a bad harness.