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  #16  
Old 02-11-2004, 03:40 AM
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no relay?

so are you sayimg there is no relay?
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  #17  
Old 02-11-2004, 04:03 AM
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I don't believe there should be a relay, it should be about like my 83 300D. Sits in 2nd gear and drops to 1st almost as soon as you hit the throttle. It's in the valve body I believe, what makes it do this.

I had this same problem as the FSM is not really specific on what year had what.
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  #18  
Old 02-11-2004, 11:11 AM
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jdblann -- Congrats!! Thats the type of fix we all live for!

kmaysob -- The relay is only on the 78-80 300SD's. In 1981 they came out with the W126 chassis, which among many other new things, has a new transmission that doesn't need the Overboost Protection (there is another form of it on all turbo diesels, but its not to protect the tranny). So I can't help you out on an easy fix on your car if it is an 83.

Best of luck with it

John
'79 300SD
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  #19  
Old 12-17-2008, 12:29 AM
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Wow fantastic. I had the same problem on my 1980 300sd with only 2nd gear starts. I found the relay, soldered the broken link, and now I have first gear takeoff. This trans 722.120 works a bit different than the 722.118 in the 1980 300d i used to have as the w123 first gear takeoff is 100% vacuum related with no relay involved. fyi in case someone else stumbles upon this old thread. THANKS!
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  #20  
Old 08-11-2009, 11:40 AM
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Just had to bring this post back to the top!!!!
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #21  
Old 08-11-2009, 11:41 AM
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Did the W115s have this same auto kickdown feature? I know my friends 76 300D starts in 2 unless you put it in 1 or press the kickdown switch.

-Jason
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  #22  
Old 08-11-2009, 11:42 AM
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Now, what activates the relay???? Brakelamps???
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #23  
Old 08-11-2009, 11:45 AM
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I read the thread only quickly but didn't it say something about the overboost protection circuit controlling the relay? Can't see how it can be the brakelamps alone because it wont shift into first without coming to a complete stop, even if you use the brakes and mimic and 'almost complete stop'.
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  #24  
Old 08-11-2009, 11:48 AM
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Interesting...mine works fine for a while and then will be inoperative for a few stops then start working again. I would be interested to find out just how it works....Robert
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #25  
Old 08-11-2009, 12:05 PM
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Sounds like your relay could use the same soldering done in the original situation.
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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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  #26  
Old 08-11-2009, 12:07 PM
Doktor Bert's Avatar
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That would be awesome....Thanks for finding this thread...:-)
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #27  
Old 08-16-2009, 01:33 PM
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Hmmmm....In all my efforts I am yet to find a theory of operation listed for this system....
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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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  #28  
Old 03-21-2016, 12:58 AM
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I am reviving this old old thread. Hope that is okay around here.

I don't see the need in re hashing the same troubleshooting steps.

I also soldered a jumper wire for the relay in the passenger footwell.

I ran a test light and I now have constant power to the solenoid in the transmission with ignition key on. When you step on the brake pedal it loses power.

I assume this is the solenoid that puts the transmission in 2nd gear when you are resting at a stop to reduce forward creep.

I crawled under the car and put my hand on the solenoid ( I assume it is the unit that is on the front of the trans, there is another wire that branches off to the rear of the trans but looks like a reverse switch)

The solenoid made no noise and felt zero "clicking" or actuation.

Has anyone else had luck troubleshooting this? Does anyone know where I can find a new solenoid assembly?

Thanks in advance guys.
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