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Old 11-25-2012, 05:04 PM
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New NSS still no start w126

I put in a new NSS. I still cannot start it without jumping terminals 1 and 3
i doubled checked the wires and its plugged in fine... There is a small wire grounded to the frame that looks like it was redone by someone else. where should i start checking?
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Old 11-25-2012, 07:34 PM
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Didn't you have the problem with the corroded wire near the junction box?
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Old 11-25-2012, 09:11 PM
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Don't know if you did this or not; on My Year and Model there is a hole in the Body of the switch and the Transmission Housing that you need to stick a Drill Bit into to line up the switch.
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Old 11-26-2012, 01:10 PM
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Quote:
Originally Posted by kerry View Post
Didn't you have the problem with the corroded wire near the junction box?
haha yep I think this saga may never end.... its one thing after another.
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Old 11-26-2012, 01:10 PM
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Quote:
Originally Posted by Diesel911 View Post
Don't know if you did this or not; on My Year and Model there is a hole in the Body of the switch and the Transmission Housing that you need to stick a Drill Bit into to line up the switch.
that is that small black lever and you put the bit into the small hole behind it right? i put those in the slots and then tightened down the nuts...
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Old 11-26-2012, 01:15 PM
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Quote:
Originally Posted by ibenz View Post
I put in a new NSS. I still cannot start it without jumping terminals 1 and 3
i doubled checked the wires and its plugged in fine... There is a small wire grounded to the frame that looks like it was redone by someone else. where should i start checking?
We need to discuss your diagnostic strategy..



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Old 11-26-2012, 01:31 PM
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Did you try jumping the NSS before replacing it and did the engine start with the switch jumped?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 11-26-2012, 02:03 PM
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Just stating the obvious, and I'm sure you did but, did you make sure the car was in Park or Neutral when you tried to start it?
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Old 11-28-2012, 01:46 AM
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In the pics below the location inside of the Car for the Electrical Connector that connects the Neutral Saftey Switch and the Back Up Lights.

Disconnect the Connectors. I am not sure on the Wire Color Coding on a W126; but, on the W123 if you jump the 2 Purple Wires (make sure the Car is in Park and the Parking Brake on) of the Connector that goes towards the Engine you should be able to crank the Starter (this bypasses the Neutral Safety Switch.)
That will tell you if the Circuit is good from the Ignition to the Starter.

If you jumper the other 2 similar Colored Wires on the Connector going towards the Engine and your Key is on I am guessing your Brake Lights will go on.
Once you have determined what color the Neutral Safety Switch Wires are turn your Multimeter to the OHM Setting say on 200 Ohms.

The Arrow points to where the Connector is located and in the other pic the Circled one is the connector.

Pick up the Connector that has Wires going down towards the Transmission Tunnel and put pic the same colored wires (Purple) and stick one probe in one side and one probe in the other.
If it is in Park and you stick the Probes in properly you should get some changes in Numbers on your Meter. It could go down to a Point something number or even zero. But, if it moves that means your Neutral Safety Switch is on.

If you do the above and your Meter reading just sits where it is just as if it is not connected you still have some issue with the Neutral Safety Switch or your Shifter Bushings are shot.
Attached Thumbnails
New NSS still no start w126-w126-neutral-safety-switch-connector-1.jpg   New NSS still no start w126-w126-neutral-safety-switch-connector-2.jpg  
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