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sirtokesalot, On that age of car I would suspect that there may be a broken wire in the rubber gaiter that the wiring harness for the tailgate goes through at the tailgate hinge area. Pop the gaiter off the body and the tailgate, gather it all to one end of the wires or other, and inspect the individual wires carefully. You may find the culprit. If not there, you might take the light assembly entirely out of the ceiling headliner, take it apart and check that the switch isn't corroded or carboned up in the "door open" position. A cleaning with fine emery paper might do the trick. Not sure what else to suggest if these ideas don't work out?

The only thing I know t do is replace it. The rubber is breaking down and nothing is going to stop that process.

The operation of the system seems very rudimentary for the most part. I'm just having the worst time tracking down where my voltage is dropping out. As far as I've diagnosed, all of my fuses and fusible links are in good working order which I guess leaves only the headlight relay the missing link I suppose, but the spaghetti of wires on the passenger side fender/bay makes it very difficult for me to physically trace wires to where they're supposed to go. Does any of the fan's wiring go directly through the firewall at any point during it's circuit? And if not, which relay is the headlight relay? My only other knowledge is that the headlights turn on without issue which I suppose would mark it off of the list of things I need to check, unless I'm missing something entirely? George - Thank you for the heads up! I did find and download the service manual that it on that post. I will scour through it to locate a better wiring diagram. Thanks!