I have searched all the forums on this site, but nothing helps.

I need to run some wires to 2 switches and 2 gauges and cannot find an appropriate existing path. Where can I find help, can someone point me to diagrams or tell me the best way to run wires from under the hood to the dash area and also to the trunk?

any help would be much appreciated

btw - 1993 300d 2.5 turbo

thanks again...

Right behind and over the brake master cylinder area, in toward the center of the car, you will see a large rubber plug with a number of rubber nipples of various diameters sticking out from the plug, and some wires and tubes porting through several of the nipples. There are a number of unused 'ports' - piercing a hole in the appropriately sized nipple, slightly smaller than the diameter of the wire (or vacuum line) that you want to route, will get you through to behind the dash.

Under the carpet and removable pad there are wiring channels leading to the rear of the car. I remember an older article talking about removing the rear seat back and bottom cusions and looking for pass throughs in the rear wall, but i don't remember the details. It is probably in the archives if you search under rear seat removal.

(Try this link)

Hope this helps.

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E

ok, where behind the dash? what do I have to remove to get to the wires I push through
maybe tom morning in the daylight it will make more sense...

That rubber port in the firewall is right in front of the instrument cluster in the dash. If your tach and clock were transparent, you would be looking at the back side of the rubber plug.

__________________
John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E

ok, what is the best way to get from there to somewhere where I can mount a switch (maybe the ash tray?)

Good grief man, they just told you to run the wires through the grommet. Then the wires ends are in the area behind the dash. Sooo. Obviously, you have to remove something to get to them. I would suggest removing all or some of these things.

1. Instrument Cluster - do a search. Requires to hooks. Easiest to buy them on the net.

2. Under dash kick panel Driver's side.

3. Radio - Requires removing the horizontal wood piece at the front of the console. Requires two cheap radio release tools.

4. Glove box - Remove the male and female plastic fasteners.

Nobody is going to tell you exactly where to route your wires.

Steve

Amazing stuff indeed.

wow, sorry - I really did have different expectations. from my other experiences on this forum regarding maintenance and such, I am used to being informed exactly how to perform the work with specific details.
I guess running wires is a completely different beast.

thank you very much for your time.

Hello there !

Hope you can solve your problem soon. I take the opportunity to ask you, hoping you know what I donīt: where does the tachometer cables land under the engine hood, when trespassing the firewall, coming from the instruments panel. I can see the cables going out from the tach (one is red and black and the other is green and yellow) but I cannot find them in the engine compartment, as they put all inside large plastic tubes.

I have the electric diagrams of the MB W124. However, the ones I have are too schematic, and donīt show wich cable is attached to each pin of any plug of the cables.

Have you discovered the whereabouts of the tach cables in the engine compartment? I need to find them to connect to a new diesel engine I installed.

Thank you in advance.