[W126 Coupe] Windshield Wiper

[Dick Spellman]

Hi Josh,

Well a frozen motor would create some resistance as in a short and I'd 
think blow the fuse.  An open would leave the duse intact and just kill 
the motor.  So, somewhere there is an open in the circuit based on what 
Camran described.  I'd think the stalk would be flaky before just 
dropping out but, don't have much experience with that.

So, I think it is safe to say the linkage is intact.  I suspect that 
good looking fuse is the problem at this point as is so often the case 
on the fuses if not routinely replaced 1 X every 10 yrs or so.

Regards,
Dick


Josh Allen wrote:

> If the wiper transmission was still intact but the motor itself had 

> siezed or failed, wouldn't that still have a firm wiper result on the 

> check that was just recommended?

>

> When I had my SD's wipers fail, it was a ball joint in the wiper 

> transmission failing due to rust on one the ball, but the only service 

> part that is easily available is the motor itself, so I'm lead to 

> believe that they do occasionally go out.

>

> I don't have the wiring diagram here at the moment, but I think it'd 

> be possible to test for continuity and appropriate resistance through 

> the motor where the plug passes through the false firewall, just ahead 

> and inboard of the brake master cylinder.

>

> -Josh

>

> Dick Spellman wrote:

>> Hi Camran,

>>

>> Well if the arms are firm you don't need my write-up.

>>

>> Do replace the fuse or swap one of equal value known to be working as 

>> Jim Houk suggested.

>>

>> If that works, great.  If not, try different positions on the stalk 

>> to see if perhaps you can rule this in or out too.

>>

>> Dick

>>

>> Camran Nassiri wrote:

>>> Hi Dick- the wipers are firm and don't move.  Right before it 

>>> stopped working the blades were going back and forth at a slow pace.

>>> Thanks for your help; it'll be great if I could get the write up you 

>>> have.

>>>

>>> Thanks,

>>> Camran

>>> 90 560SEC, 91 420SEL, 80 240D

>>> Hayden, Idaho

>>>

>>>

>>>  

>>> ------------------------------------------------------------------------ 

>>>

>>> Date: Fri, 14 Aug 2009 14:52:23 -0400

>>> From: dick.spellman at gmail.com

>>> To: mbcoupes at mbcoupes.com

>>> Subject: Re: [W126 Coupe] Windshield Wiper

>>>

>>> Hi Camran,

>>>

>>> Easy enough to check.

>>>

>>> Grab a wiper arm and see if you can move it freely across the glass 

>>> and report back.  It will either move very easily or feel firm.  If 

>>> firm the linkage is fine.  If free to move about, it's the linkage.

>>>

>>> Let me know.  I did a write up and photo shoot of the entire r&r of 

>>> linkage and motor some time back.  Will have to see if it's still 

>>> here.  Otherwise it's in the MBCoupes archives or perhaps I sent it 

>>> up to Steve Nervig's pages.

>>>

>>> Regards,

>>> Dick

>>>

>>> Camran Nassiri wrote:

>>>

>>>     The windshield wiper on my 90 560SEC (71K miles) suddenly stopped

>>>     working.  The windshield washer, however, still sprays.  I have

>>>     already checked the fuse (#17) to no avail.  If the motor is bad,

>>>     how hard is it to replace and where in the car is the wiper

>>>     motor?  Any other thoughts?

>>>

>>>     Thanks,

>>>     Camran

>>>     90 560SEC, 91 420SEL, 80 240D

>>>     Hayden Idaho