I need the wiring diagram for the plug into the ignition switch on a 1980 300 D. The wires are all color coded and the holes in the plug are all numbered. I need to know which wire to stick in which hole.

Richard

You will find that information in chapter 80-300 in the factory service manual. This can be source for free via www.startekinfo.com - there are several threads on the subject of getting information from this site (this is difficult because their site is not very reliable)

Here's one I started

Mercedes Startek have done the right thing - to help you do the right thing!

I'm not 100% sure if they have uploaded the electrical trouble shooting section of the CD though

If you get stuck you will be able to find help here =>

Online Tech Links Thread - Mercedes-Benz Forum

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

I had an 83 240D and I have the book for that car. I suspect mine was similar.

There is a method to the madness, the terminal numbers and wire colors all have meaning.

You should have two terminal 30s, they are the feed from the battery, the wires will be solid red. Either solid red can go in either 30, they are connected together internally.

Terminal P30 is for the standing lamps, live in off or accessory only, green/white wire

Terminal 15 is the main switched power feed, live in run or start, red/black wire

Terminal 15X is the feed to the climate control blower, live in run only, red/yellow wire

Terminal 15R is the secondary switched power feed, live in accessory, run, or start, red/green wire

Terminal 50 is the start signal, violet/white wire

__________________
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

Thank you Jay Bob. That should help enormously. Even if a few things are different, your reply gave me the information that will enable me to check the switch terminals with an ohm meter and get the right wires to them.

But, I strongly suspect the switch plugs are the same.

Thanks again. I was sick when that plug came apart and those wires pulled out, and I had no idea what they were or where they went.

Richard