How do you disconnect the rear bumper wiring harness On a 1972 GS?

Looks like the rear bumper harness goes through drivers side of trunk to a connection? How do you disconnect this harness to remove rear bumper?

Thanks

 

It unplugs from the body.. Just left of center...

 

There is a rubber connector that goes from the bumper into the trunk. You can disconnect the bumper wiring from inside the trunk by prying the approx. 2-inch diameter rubber grommet out of it's hole in the trunk sheet metal, then you can disconnect the socket.

 

Thanks