My 93 300SD has jammed wipers. When I turn the key, they jerk a tiny bit, but don’t travel at all. If I put the stalk controls on full, they will jerk again a tiny bit, but not move at all. Trying to manhandle them to move from their current position of about 45 degrees tilted up doesn’t work. I can’t seem to get enough force to move them.

I have no way to know if the relay is good, but it does seem like the system senses that they’re there and wants to move them. It seems like they’re jammed.

Any ideas on how to work with these so I can at least force them into a service position?

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

I pulled the wipers apart and the passenger side was seized tight. Hammering, penetrant, etc would not work. The motor, relays, and main wiper works perfectly.

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

you may try soaking the whole thing in atf for a day and see if it frees up. I recently did a similar job but on an old mazda RX7.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)