I'm glad to hear that you got it resolved. On my 87 wagon, I tried the switches and thought I had it licked, then POP i blew another fuse out of the blue. It turned out that the wires in the door jamb were failing. and the kids using the back doors caused it to be intermittent. Ended up splicing in new supple wire in the hinge area to facillitate movement. Hope your fix sticks.

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Dean