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  #1  
Old 01-17-2002, 02:43 PM
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Join Date: Apr 2000
Location: Falls Church, VA
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280C Combo Switch Problem

My '73 280C has the normal problem of the turn signals not staying "engaged" during a turn. Unfortunately, in VA this will cause it to fail its safety inspection. I found another used one - believe a later model for a great price that works perfectly, except that the wipers will not turn off. All three wiper speeds work.

The switch is disengaging and opening the contacts correctly.

I investigated and noted that there are two addtional wires running up the stalk to the wiper controls in addition to blue, red and black in the orginal- they are green and grey.

Has anyone encountered this, and knows what wire(s) to remove to avoid getting constant power to the wipers?

TIA
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #2  
Old 01-17-2002, 04:38 PM
Mark V.II
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I didn't realise that was a common problem. With the switch on my '69 230, I took the dremel tool and a very small bit and made a bit more of a land where the pin sits so it is more inclined to stay there for a bit.

Another thing that I find helps, is to pull the rubber boot from the column, it was counter productive to keeping the signal on, and it was worse the colder it was.

Hope that helps.

Mark
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  #3  
Old 01-17-2002, 04:47 PM
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Join Date: Oct 1999
Location: Tulsa, OK USA
Posts: 139
Chuck:

Check this thread. It has more detail and some pics on the dremel fix by Mike Tangas.


Turn Signal Switch


Dan
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'84 300D/'90 Jaguar XJ6/XJ40
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  #4  
Old 01-17-2002, 06:06 PM
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Join Date: Aug 2001
Location: Walnut Creek,CA
Posts: 274
In my 1974 280 the turn signal doesn't stay engaged and the second wiper speed doesn't work. How hard is it to replace the whole stick?

Thanks for your help,
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  #5  
Old 01-17-2002, 06:17 PM
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Join Date: Apr 2000
Location: Falls Church, VA
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It's easy but expensive. Your wiper problem may be in the relay which is located in the motor.

You can check out the contacts in the switch by very carefully removing the pin that holds the sliding part of the switch on. It runs vertically.

If you look at the big connector that the wires from the switch runs to, I believe that power comes in on pin 11 and then 12, 13, or 14 get power depending on the wiper speed. You can also check at the pins on the wiper motor.

I will take a look at the Dremel repair but the newer switch is a much better design, and it would be nice to use it.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #6  
Old 01-17-2002, 06:40 PM
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Join Date: Aug 2001
Location: Walnut Creek,CA
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To remove mine is the same as in this post?

Turn Signal Switch

I found a used one that I think will fix the problem. I think a new one costs $220.00 or so.
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  #7  
Old 01-17-2002, 07:22 PM
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Join Date: Apr 2000
Location: Falls Church, VA
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Yes. But you need to loosen the connectors that hold two wires to the switch and then get under the driver's dash on the left to unplug the big connector. Then slide the connector out through the "tunnel" on the steering column. Reassemble in reverse order. I would recommend plugging the new switch in before you install it to make sure you can shut the wipers off.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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