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Old 06-26-2017, 11:32 AM
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Join Date: Oct 2015
Posts: 125
w114 cruise control module ?? and speedometer

speedometer stopped working attached a drill to cable driven in reverse needle does move wondering if theres a fuse ?? or cruise control module is there any way to test ? will it prevent speedometer gauge to stop working ???
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Old 06-26-2017, 01:42 PM
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Join Date: Feb 2008
Location: Atlanta, GA
Posts: 2,766
You may have a broken speedometer cable.

Otherwise, I do not know the W114 but I purchased gears for my w126 (1981 300SD) at Odometer Gears - WELCOME for something like $50-75 and made the repair. I suspect yours is mechanical and one or more of the plastic gears might have deteriorated. Very easy repair. There are several links in the forum telling you how to make a repair.

Good luck.

Last edited by tyl604; 06-27-2017 at 11:17 AM.
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Old 06-26-2017, 06:12 PM
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Join Date: May 2010
Posts: 720
Those cables do break--the cable route is somewhat exposed to road hazards.

If you want to use your cruise control with a new cable you'll need one with a speed-box or sensor located mid-way, under the driver's side floor mat.

The cruise-control units were made by Philco or VDO, I believe--and may have different cables for different versions--otherwise a stock cable will work if you don't use cruise control.

I have a VDO 0-140 mph speedometer if you need a working unit--good luck

Tim Kraakevik
St. Charles, IL 60174
630 940-2420
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Old 06-27-2017, 09:45 AM
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year /model?
99 E320 THE Queen Mary
62 220b - Dolly - Finally my Finny!
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
07 Lexus RX 350 - Lexi
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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Old 06-29-2017, 12:46 PM
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Join Date: Oct 2012
Posts: 8,493
If the needle moves then watch the odometer. Are the numbers turning? If yes then look at the trip odometer. Are the numbers turning? If yes to both questions then will the trip odometer reset?

If yes then your speedometer is fine.

So it is on to your cables. (The system on the 114 is mechanical. There is nothing electrical that can prevent the speedo from working.) What I have found is the system has a flaw in it that only becomes apparent with age. That is, if this is the typical system and not an aftermarket one.

The speedo cable comes up into the car. Find where it begins, under the car, and see if it is still attached. If so then move on into the car, or perhaps under the hood (these were mostly dealer installed so sometimes the installers got creative) and find where the speedo cable comes into the car. It will attach into a 'box' which is actually more of a mechanical connection looking thing. This is a pulser that sends a speed signal to the workings of the cruise control.

There will be another cable coming out of it and that cable attaches to the back of your speedometer.

Now, back at the pulser... Due to vibration over the years the cables can work their way loose. It will not take much for the cable to fail to connect, and if it is not engaging the interior of the pulser it will not drive the cable to the speedometer.

And the flaw I spoke of? At the dealer the installer was supposed to dab a bit of paint on the outside of the cables to prevent them working loose due to vibration. And a lot of them failed to do this.

I might have a pulser here somewhere, or at least a photo of one. If I can find it I will post the photo and you will know what you are looking for.

One bit of good news.... These pulsers were generic things. If you can't find another 114 to pull one from then search the salvage yards for Hondas. They used the same type of pulser on the Civics up until 1986. Or hit Evil Bay.

Best case is the cable just shook loose at the pulser. Screw it back together and put some tape around it to keep it from backing off in the future. Don't tighten too much. These were made of soft metal and deform easily.
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Old 07-01-2017, 07:14 PM
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Join Date: Sep 2002
Posts: 23
I'm trying to install a speedometer cable on a 1972 Mercedes W114 that does not have one. I found the area to attach it behind the instrument cluster and the hole to run it under the car. But where does it attach to the transmission? Anyone have a picture or a description? Thanks! Jay
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Old 07-01-2017, 08:21 PM
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Join Date: Oct 2015
Posts: 125
my 76 280c one cable attaches to speedsensor then other cable fr sensosor thru hole into gear housing on transmission need 10 mm socket with short extension I use 1/4 in drive bolt needs to be removed completely for longer cable to be removed fr gear housing
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Old 07-02-2017, 07:44 AM
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Join Date: Sep 2002
Posts: 23
Thanks for the reply. I did find the area to attach the cable. On my car it's on the rear end of the transmission - originally I was looking at the front end.
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