Ah ha, now we're getting somewhere.
So now we know the motor is good and the regulator is good. You've got a couple
potential problems:1. Dirty switch(s)2. Broken wire
Easiest is to clean or replace the switch. I used to just buy replacements from
Rusty but I checked both Dr. Fatty and Rock Auto and couldn't find a
replacement switch from either...
-Curt
From: Larry Turner via Mercedes <mercedes@okiebenz.com>
To: mercedes@okiebenz.com
Cc: Larry Turner <l02tur...@comcast.net>
Sent: Wednesday, February 22, 2017 8:42 PM
Subject: Re: [MBZ] Rear Window
OK Gang,
This comment is meant for all of those who made great suggestions
and helped me learn how the electrical system is designed specifically
concerning the motors & switches for the rear windows.
Back when I was younger I would have looked at the wiring
connections going to the motor but now with the medications I am on,
thinking is slower and less focused - (people who abuse narcotics must
have terrible problem solving skills!). I take my pain meds. as
prescribed or at lower rates than prescribed and still have trouble.
Anyway, after reading all the great descriptions and suggestions
the light finally came on and I could see what several said about
putting + and - from a separate source. There's a connector on the
rear door panel that is where the switch connections attach to the motor
connections. I removed the motor wiring and attached 12v from one of my
spare batteries - I had it backwards at first and got a spark - so I
reversed the wires and the glass went up as it always has up until a few
days ago.
Thanks for all the help -
LarryT
91 300D
On 02/22/2017 6:35 PM, Peter Frederick via Mercedes wrote:
> It's fairly common for the brushes to burn the commutator in the closed
> position, as it's hard not to hold the switch down a second after the window
> is up, causing excessive current flow.
>
> Obviously, tapping on the motor will bounce the brushes enough to get the
> motor off the stalled position, and it will work for a while after that.
>
> I believe you need the regulator in the down position to get it out of the
> door, at least you do on the front doors.
>
> Brown is ground.
>
> Peter
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