This problem is associated wit a 1989 300te. The windshield wiper stops functioning, oddly it seems to be associated with condensation and moisture so every time it rains the wiper stands a good chance of not working. I believe I have zeroed in on the fuse holder being the problem - if I open the lid of the fuse box and tap/push on the holder of the fuse associated with the wiper it typically solves the problem. Seems as if there is a problem below the holder but I don't know how to disassembel so I can inspect/repair. I have cleaned the terminals and fuse ends so this does not seem to be the problem. Any help would be appreciated.