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Easy. The headliner has a metal 'edge' sewn into its rear border. With CLEAN HANDS, pinch the rearmost part of the headliner near one hinge, and draw it aft. It's stretchier in warm weather, but it should stretch enough for you to get it off. Once you've peeled it back you can trace the gray-sheathed wire bundle back to a plastic connector on each side.
As far as replacing the harnesses - I prefer to remove the tailgate (you'll need a helper, it's not heavy but it is unwieldy) and put in new Volvo harnsses. Some Bricksters splice in replacement sections using test-lead wire; regular stranded wire is not flexible enough for repeated opening and closing, and will break again soon. Some have bypassed the through-the-hinge approach, but IMO the results are less than appealing to the eye although quite functional.
From probably '85 on, the tailgates are all wired about the same. Search the archives here to get a variety of approaches and details which I've likely left out.
BTW, note that the hinges themselves each have a ground wire. Check this for electrical and mechanical integrity when you do the job.
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