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#1
11-06-2015, 06:37 PM
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300D 4 speed conversion wiring
I had my 1980 300D converted to 4 spd manual around 2 years ago. Due to a move the car sat for that time until I recently recovered it. The mechanic connected a wire to the switch on the clutch pedal assembly as a clutch safety switch. The wire is patched into the ignition wiring connecting to a purple wire with a white stripe on it (coming out of the ignition tumbler wiring). It works, the car willn't start without the clutch depressed.
However when driving the car the glow plug light is now coming on at random times all by itself. Just comes on for a few secs while driving or it will sometimes come on if I turn on another electric device like the wipers. I was wondering if anyone has any idea if that wire should go to a different wire on the ignition? I would rather not have the plugs coming on while driving and would prefer to keep the clutch safety switch. Any ideas? 
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#2
11-06-2015, 06:42 PM
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So you are saying that you can not put your car into neutral , let out the clutch pedal... and start the engine ?
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1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#3
11-06-2015, 06:46 PM
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I can't imagine why anyone would want to complicate things with a clutch safety switch, but since you do, I have the same year car as yours. When I removed the ignition switch (that's a misnomer—ignition switch on a diesel car) the wiring plug came off and all of the wires popped loose. What to put where? After some painful research I finally found a real diagram of my car's switch configuration. It would appear that every year they changed it.
Anyway, if you need it I will be glad to post it. Richard
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#4
11-06-2015, 06:59 PM
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I would love to see a post of the wiring diagram if possible.
The car will not start without the clutch depressed. The NSS is not connected as far as I know. Not sure why they didn't put it in there, perhaps I didn't provide all the parts to connect it. It was a couple years ago. Most likely I will simply remove that switch. It's not something I thought about when doing the conversion and they mentioned it and I said sure go ahead.
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#5
11-06-2015, 11:24 PM
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The switch on the clutch peddle is to disengage the Cruise Control.
I don`t think any of the W123 manual cars had a safety starting switch on the clutch peddle. The mechanic may have wired it that way. I posted some links in this thread on the wiring, it might be what you are looking for. http://www.peachparts.com/shopforum/diesel-discussion/373267-300cd-conversion-questions-lights-plate-brace.html Charlie sent from my pos computer
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#6
11-06-2015, 11:34 PM
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Quote:
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#7
11-07-2015, 01:53 AM
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So what happens if the clutch peddle is pushed in and the CC in on?
Wouldn`t the engine rev up? Charlie sent from my pos computer
__________________
there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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#8
11-07-2015, 03:04 AM
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Quote:
I don't think the OP's issue is due to this.... It is more then likely a glow plug issue....I don't know if he has pencil or loop style....Under dash relay, legged relay or the fender mounted one..they were replaced by... Could be a simple ground issue...
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#9
11-07-2015, 09:19 AM
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Quote:
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html
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#10
11-07-2015, 11:38 AM
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On a manual conversion its very easy to hook the NSS up to a clutch safety switch. I'm planning on wiring both of my manual conversions up like that at some point whenever I have the time. Currently the 300TE is simply wired together so the car always thinks its in neutral and in the 240D I removed the NSS from the automatic transmission and routed it inside the car and its currently in the park position.
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#11
11-07-2015, 01:23 PM
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The 1980 has pencil glow plugs. The relay not sure which one is in there.
IDK if I was supposed to pull the NSS wiring harness from the 240D manual donor car. I can't seem to find it and I know it's not in the 300D. From memory I believe the car's auto trans NSS wire harness was toasty and fell apart as most do. Looks like it's hanging under the car right now - it's shot. I guess the mechanics bypassed the NSS altogether and perhaps this is causing my problem. They did wire that switch on the clutch to be a clutch safety switch. Since there is no NSS tho I'm wondering if the car thinks it's in park and fires the glow plugs when driving because there is no NSS connected. As such I don't have back up lights either but that's an easy fix. I need to figure out why the glow plugs are firing when driving and how to cure this. I can go without the clutch safety for sure.
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#12
11-07-2015, 02:29 PM
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The ignition switch controls the glow plugs, not the NSS switch....
Read this thread, about a member bypassing his, when he did the conversion... http://www.peachparts.com/shopforum/diesel-discussion/333235-need-help-nss-going-auto-manual-trans.html The issue is, are they coming on? or is just the glow plug light coming on? I am not sure, if there is a ground issue...If this would cause the light to flicker...or not....The only other things that will cause this....Is the relay or ignition switch...
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#13
11-07-2015, 06:15 PM
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Thanks for the link I looked for hours before posting this didn't find that link before.
Is not the NSS wired into the ignition wiring at some point so the car does not start in gear (auto trans)? IDK honestly but I assumed there was some connection there to the ignition tumbler wires, thanks for the help.
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#14
11-07-2015, 09:20 PM
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With out pulling up a wiring diagram, I can't specify that. I believe that the wire, that excites the starter when the switched is turned, is spliced for the NSS....Its been awhile since I dug into that...
Here is a couple links on threads, that had the same issue with the flashing...Most were cured with a new glow plug relay....I hope for your sake, that you don't have the legged version...That is pretty pricey! http://www.peachparts.com/shopforum/diesel-discussion/316879-glow-plug-light-flickers-while-driving.html http://www.peachparts.com/shopforum/diesel-discussion/349792-glow-plug-light-comes-while-driving-1983-240d.html
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#15
11-07-2015, 10:24 PM
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Quote:
Charlie sent from my pos computer
__________________
there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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