Been looking over the threads on cruise control for my 87 300D and before I start tearing into it, would missing the 3rd brake light (the one in the back window) cause the cruise not to work?

mines totally gone. wires are just hanging in the trunk for it. At first I thought I would be smart and just jumper them but of course blew the fuse...

So I figured I better ask to see if there would be another solution for testing.