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  #1  
Old 07-02-2005, 08:21 PM
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300D Combination switch replacement (hi beam problem)

I've been having some trouble with the sensitivity of the hi beams on the combination switch on my 85 300D, is this a possible DIY job to repair, do I even need to replace the entire switch?
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  #2  
Old 07-05-2005, 01:24 PM
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if the switch doesn't click from low beams to high beams reliably the springs in it might be shot. I've never seen one like that. Combo switches often get worn and fail to stay locked into a turn, there is a fix for that BTW using a swiss file to correct for the worn metal notch where the signal switch goes when signalling a turn. there is info on it somewhere on the 'Forum, try the search feature.
This job is a diy but one warning! Getting the steering wheel off can be a real bear if you don't have an air driver set to over 100 ft lbs torque, using armstrong method is sometimes successful if you are well equipped (muscular) with a long 1/2 in breaker bar and sometimes it takes two men to get the fool nut loosened, as there is a bit of locktite on it as well as it being very tight (major safety item here, right?)
Find a hex driver first and get a shop that has an air tool to loosen it for you if you can't get it loose manually. Be sure to mark the wheel hub at the splines where it goes onto the steering column, so you put it back exactly the same position. An engraving tool is handy to mark the wheel and the shaft.
You need to remove the under panel cover that will allow you to thread the old cable out and the new one in. Its very simple once you have the cover off and the steering wheel off.
Good luck!
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  #3  
Old 07-05-2005, 03:07 PM
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It just flashes hi beams all the time, it locks into the turn signals and the hi beams fine, but it consistently flashes the hi beams if i so much as brush it with my fingers while driving which seems like a safety hazard to me. I doubt I'll be able to get the steering wheel off myself (no muscle, definitely no air driver or shop relationship) so I suppose its off to the shop for this one.

Thanks
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  #4  
Old 07-05-2005, 06:57 PM
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The wheel does not need to be removed. The switch comes out the side.
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  #5  
Old 07-22-2011, 06:28 PM
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I figured I would revive this thread instead of creating a new/redundant one.

I'm having the same issue on my 300D. But I really don't want to remove the steering wheel to replace the combination stalk. Is there a way around this?
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  #6  
Old 07-22-2011, 07:46 PM
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You don't have to remove the steering wheel to replace the Combination switch. Remove the rubber boot, remove the two screws, you have to remove the panel under the dash, (a couple of screws) in order to unplug the cable. That is all there is too it! Should be able to do that before breakfast.
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  #7  
Old 07-22-2011, 11:19 PM
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FWIW, The steering wheel on my 85 sd and an 89 126 came off easily. Tools: 10mm allen socket, adapter to 1/2 drive bar or ratchet, trusty 3 ton jack handle that I use for leverage. Per haps short eltension to get proper alignment. Make sure the steering column lock isn't engaged or you may break it.
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Old 07-23-2011, 02:19 AM
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On a 126, the steering wheel must come off. On a 123, no.
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  #9  
Old 07-23-2011, 08:52 AM
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Quote:
Originally Posted by toomany MBZ View Post
On a 126, the steering wheel must come off. On a 123, no.
Do 126 and 123s use similar systems to attach the wheel?

My point was removal isn't difficult with the proper tools. Perhaps an impact would be useful also since the jarring gets threads free differently than steady twisting.
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  #10  
Old 07-23-2011, 02:30 PM
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AFAIK, the wheel itself is mounted similarly.
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  #11  
Old 07-23-2011, 02:37 PM
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I got combo switches.
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