Gonna do the swap to my 81 soon. I've dug through the threads of others who have tried this but I have one unanswered question regarding the wiring. What about the neutral safety switch? Also about the backup lights? I assume these are the same.... I thought this was pretty much plug and play but I suspect the harnesses are different.

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1978 Mercedes 240D
1981 Mercedes 240D
1982 Mercedes 240D

its just 2 wires for each switch ...
Neutral safety is not so needed ...

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current fleet
Ford f350 dully 7.3L 1990 . ats turbo , zf5
Mazda 4x4 b2600 with 617 20-26 mpg
Past fleet
1983 240D w123 232k 25-30 MPG
1984 Ford f250,1979 ford 150 300-6 (sold@ 251K )
81 300D, 79 240D , 2x 76 300D ,74 240D , 2x 89 grand prix , 85 grand fury , and several other fords

Custom machine shop work ..

The back up light switch is on the 4-spd shifter.

You remove the nutral safety switch that was plugged into the auto trans. that switch has 2 wires and contacts for the back up lights, and two wires and contacts for the starter.

The cable/wires from the NSS come into the cabin area through the tunnel near the fuel peddle. they connect to a plug above your right knee behind and at the top of the tunnel carpet. unplug it, throw it away, then plug in the back up light wire plug from the reverse switch connected to the shifter.

Remove the grommet in the tunnel, degrease/wash it, reinstall it and fill the hole with RTV.

Need Help. NSS and going from auto to manual trans

Neutral Safety Switch Troubleshooting 84 300D

240D 4spd in 1985 300TD


Charlie

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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

also search for posts from greazzer, he bought my old auto 240D and turned it into a manual 5 speed....and went through this exact same issue.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Thanks guys. LAst remaining issue I had to work out before swapping the manual tranny out of the 82 over to the 81.

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1978 Mercedes 240D
1981 Mercedes 240D
1982 Mercedes 240D