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My right rear window on a 1987 300 TD will go down but not up. I have changed the regulator with a known replacement but the problem persists. I have checked the wires and they appear to be in good condition. Both the door switch and the front console switch appear to be working.
Any assistance would be appreciated.
Russell

You'll want to check the wires that lead from the post into the door through the accordian tube. Mine exhibited exactly the same. Wire insulation was intact but the copper braid was broken. Otherwise it's the regulator.

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DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV

dlssmith hit the nail on the head. This is a very common problem and its an easy DIY job if your are careful. What you need to do is to splice in new wires to replace where it flexes in the door joint and the copper work hardens under the insulation and breaks. Placing some shrink tubing over the wires helps to keep them all together, if you want to be real professional

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!