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#1
04-06-2010, 11:56 AM
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Rear Window will only go one direction: up or down
I choose UP of course but...
Sorry to repeat common problems, however I hope some resident expert will recognize this issue faster then I can navigate searches and DIYs My right rear window on a 1977 300D went down to no return yesterday; right before the southern pollen dump! Those promiscuous pines! Well I am fortunate to have a donor and tested a spare motor; here is the odd and hopefully obvious issue = the switches (front or rear) will only power a window motor one direction???? not the other Being an older style (here it was a smart option they should have kept!) even the rear window wiring has an in-line terminal connector for the 2 wires coming from the switch going to motor (just like all front windows on 123's). I reversed this and now the switches raise the windows (yeah! no rain) but they will not lower???? Does anyone recognize or suggest a common method to hunt down the issue here? Simply put again: window switches will only move motor in one direction!
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1990 300D 2.5Turbo, two tank WVO, daily driver 300,911 1992 E300 gaser, 150k. Parts only, For Sale [B]1984 300TD Euro 4speed Sold 1977 300D Elsbett SVO single tank Sold 1981 300TD "Silver bullet" 285k ran B100 Sold 1981-5 300D x 5 cars stripped and reused, parts for sale Other toys: 1995 Dodge 2500 Cummins 12V P7100 Bosch mechanical pump with 2 tank veggieconversion kit, only 120k! 1959 Cadillac  Dad's legacy, needs finishing
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#2
04-06-2010, 12:08 PM
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Most probably, the wire which is normally positive for the "up" direction is broken.
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#3
04-06-2010, 12:14 PM
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do you know the wire number or color by chance?
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1990 300D 2.5Turbo, two tank WVO, daily driver 300,911 1992 E300 gaser, 150k. Parts only, For Sale [B]1984 300TD Euro 4speed Sold 1977 300D Elsbett SVO single tank Sold 1981 300TD "Silver bullet" 285k ran B100 Sold 1981-5 300D x 5 cars stripped and reused, parts for sale Other toys: 1995 Dodge 2500 Cummins 12V P7100 Bosch mechanical pump with 2 tank veggieconversion kit, only 120k! 1959 Cadillac Dad's legacy, needs finishing
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#4
04-06-2010, 01:45 PM
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After you trouble shoot the wiring and everthing seems OK I would not discount that the Rear Window Mounting Plate is warped/bent and that is what is stopping it. I believe if they bind up enough the Window Relay cuts off the power to the window in that directionl.
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84 300D, 82 Volvo 244Gl Diesel
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#5
04-06-2010, 04:14 PM
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From what you are saying then both wires are ok and I would say the switch needs cleaning as it sounds like it is not making contact on the normal up points. There are a lot of write ups about cleaning switches. Depending on which way you want the window to go one wire goes to ground and the other gets 12 volts and then when you want the window to go the other way it reverses this.
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1983 300SD 200000miles
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