[W126 Coupe] Strange electrical behavior questions

[Mister McGoo]

Josh;
 
1. The comment on solder joints is valid.  To repair you remove the climate control unit.
 
However, DO replace the 30Amp strip fuse.  That is the power to your fan.  When this fuse becomes a problem SOMETIMES the contacts become intermittent and melt their little after-thought fuse box... sometimes cooking the wires at the same time.  I have replaced that fuse holder box and fuse complete in my cars.  Cheap.  Less than $3.  The fuse is 000 545 20 34 , 30Amp from any dealer or MB parts supplier.  And yes, DO replace all of the "normal" fuses in your fusebox.  Good idea every couple of years... everybody SAYS that, but almost nobody DOES (I don't.  I enjoy the challenge of holding a flashlight in my teeth while swearing at these crappy pre-WW2 vintage fuses in the pouring rain.... the fuses you need friggin tweezers and three hands to install.)
 
2. High beam not working?  First check that your H4 bulbs are OK.  Highly unlikely that both highbeams are burnt out but takes 2 minutes to check and may save minor grief of removing the steering wheel.  Getting at the signal/light assembly is not a huge deal assuming that your '85 is NOT equipped with airbags.  To remove the steering wheel pop off the M-B plastic symbol center of the wheel.  Use a 10mm hex to remove the center bolt.  Do NOT rely on the steering lock to hold the wheel against the force needed to undo this bolt... it's tight and you can damage the locking mechanism.  When the bolt is removed, mark the wheel against the shaft accurately in order to get the wheel back in the same position.  The steering wheel pulls off the spline shaft and the removal of the turn signal assembly should be fairly obvious.  If this assembly is badly worn, a new assembly is not THAT expensive.... around $145. 
 
4. The rear defroster switch symbol should light up and stay "on" for the duration of the timer in the relay. 
 
Just some random thoughts off the top of my head... Good luck.
 
-Bellamy




> Date: Fri, 22 Aug 2008 00:52:50 -0700> From: heyallen at null-ptr.net> To: mbcoupes at mbcoupes.com> Subject: [W126 Coupe] Strange electrical behavior questions> > Ok all, I have a couple of strange electrical questions for anyone who > cares to risk a guess.> > This is all in/on an 84 500SEC euro> > 1st:> My climate control has decided that the high button, as well as Defrost, > are apparently unnecessary. > When I select auto, the fan works normally, and quietly.> When I select any mode OTHER than defrost, it works normally.> If I select Defrost or Max speed, though, it thumbs it's nose at me and > gives me silence.> > I've just recently replaced the fuse in the fuse box listed as serving > the fan, (and replaced it again, with a ceramic insulator fuse, after it > spit the plastic body one out the side, partially melted)> > Is the 30-amp strip fuse serving the full speed circuit alone? If so, > that might explain it, though the strip fuse has had a crack all the way > through it for the whole time I've had the car, and the fan has worked > up until this week. (Mostly due to my not being able to find a source > for the 30-amp fuses, only the 80 and 50 amp ones.)> > 2nd:> This car came with euro lights on it. If I jumper power in the fuse > box to the high beam circuit, the high bulbs work. > That being said, they do NOT work when selected either with the > "passing" mode (pulling back on the arm), or when high beam is selected > by pushing forward and letting it click there.> If set to high, the lights go out completely.> > I have not been able to get into the steering column yet to tear the > light selector switch apart and look for wear in it's contacts, but > barring any suggestions, I'm leaning that way next, just dreading trying > to get the wheel off.> > 3rd:> Related to the prior question: how are the euro light wipers and > sprayers supposed to be controlled? I see a fuse for it, but they don't > seem to do anything.> > 4th:> How is the defroster supposed to work? I can select it, and it > momentarily gets brighter on the upper position, but nothing seems to > say that it's working, and it doesn't seem to defrost anything.> > > Well, that's all that I've come across that I haven't been able to find > an answer to in digging around in the various forums that I browse, or > during listening to this list.> Thanks for any ideas, and happy wrenching or driving to all of you!> > -Josh Allen> The MB Coupes Website!> W126 SEC Mailing List> Postings remain property of MB Coupes, L.L.C.

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