I fought tailgate leaks on my '86 245 for two winters before figuring it out. One leak , similar to yours, was when water entered under the rubber hatch gasket along the side. The water then ran down between the body and the rubber gasket to the bottom of the hatch. There the water collected until it rose higher than the little drain holes in the hatch (tailgate). The water then ran into the hatch and collected at the bottom of the tail gate and would run out when I raised the tailgate.
Since I didn't have a replacement rubber gasket for the hatch, I simply covered the drain holes in the hatch with black plastic electrician's tape. This prevented water from getting into the hatch and the water seemes to find a way out of the space at the bottom, probably ewhere the rubber didn't fit very well. If the water didn't escape, I was going to tape a small plastic tube where the bottom of the gasket meets the body to provide a drain.
The other leak, in case you are so lucky, was through the holes where the trim above the bumper clips onto the body. The water from this leak ran into the storage space under the rear floor. I sealed this with silicone along the top edge of the bumper trim.
Good luck!
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