I have not taken a picture of the seat switches yet.
Some progress on the tach today. I unplugged the cable in to the
EDS computer and found the tach in and tach out pins. Put a jumper
in and got a tach signal at the tach plug for the cluster. I plugged
in the tach to the plug, but got no tach. With the multimeter on AC
I got a tach signal at the plug, but it seemed to be about half what
it is at the EDS computer input. ???? Dunno what is up with that.
When I get the speedo fixed and plug in all the cluster stuff, maybe
it will work. Or maybe not...
Ordered drive gears from the stealer for the speedo drive. Not
interested in taking out the new flex disk and trans mount to pull
the trans back cover just to replace cheep prastic parts. (sigh) In
my 110s, the drives were metal. I guess I'll have to do that next
week or whenever the parts get here.
I started laying out the wires to patch in to the speaker wires.
When that is done, then I will wire the plug for the new radio. Then
I need to pull the pass seat and figure out where the black/red wires
and ground go to. After that, I can put back the console and start
to put things together.
Is the switch the same as on an '85 201?
Send me a picture. I kept the pair I'd bought for my '85 190D, I
*think* I even know where they are. I paid big money for them from Q
back in uhhh, '05 I think when I got that car.
-Curt
From: Curly McLain via Mercedes <mercedes@okiebenz.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Cc: Curly McLain <126die...@gmail.com>
Sent: Thursday, January 7, 2016 5:37 PM
Subject: Re: [MBZ] 124 tachometers
I pulled the plug from the EDS computer. I found the tach signal
voltage in the plug to the computer, but I have no signal out of the
computer.
According to the ETM, the output is pin 25, but I see no pin for
input. There is no ID of pins in the computer or in the plug. Has
anyone seen any pinout for the ESD Computer?
I could run a jumper to the tach from the plug to check the tach, I suppose.
or swap out the EDS Computer
or dig into the harness and find the white/ in and the black/red out
and jump them.
Next: to get a speedo cable.... Then I'll figure out which option.
Since the EDS is disconnected, I'm thinking just jump the tach in to
the tach out.
Anyone have a spare speedometer cable or a drivers seat adjustment switch?
Curly.
As before, the only place that I lost the tach signal was from a
broken ground wire at the battery ground lug.
Under the bolt were 3 or 4 thin ground wires, all broken on mine.
repair of the wires restored the tach to normal.
The ground wire is after the connector near the battery.
I have a spare EDS box that you could try.
YMMV. Fred
300TDt 1987 x2
________________________________________
From: Mercedes <mercedes-boun...@okiebenz.com> on behalf of Curly
McLain via Mercedes <mercedes@okiebenz.com>
Sent: 07 January 2016 20:39
To: Mercedes Discussion List
Cc: Curly McLain
Subject: Re: [MBZ] 124 tachometers
Got back to checking tach and speedo taday. Pulled the head, cable
no turney, so looks like I need a new cable. Tach has no signal at
the head, but did have a signal behind the battery. so, it appears
like either there is no signal coming out of the EDS computer or the
wire from the EDS computer to the head is lacking continuity.
According to 136 in the 124 ETM, at the output of the EDS computer,
there are 2 wires. One runs to the tach, one to the Klima (now
called in the book "A/C compressor control relay") Both wires are
green/yellow.
So it appears that if i find a signal at the klima relay, then the
other wire is broken. If there is no signal at the klima, then
likely the EDS Comp is bad. (or the wire from the EDS comp to the
Klima is broken (not likely)
Does anyone have any experience with either? Thanks
87 300D
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