Relais Frame ...

29 June 2019

 

With original old Mercs, the electrical components are somehow "distributed" under the dashboard, hardly accesible and difficult to find.

So I came up with the idea, to put a wooden plate behind the glove compartment and install ALL fuses and electrical components there. As not all fit, I will put e. g. the seat heating relais behind the centre console.

However, the relais were a topic. Indicator, overvoltage protection, electric windows, kick-down, etc. etc. … all "somewhere". So I got a nice holder from a W126, where the connectors are clicked-in from underneath and you just put the relais on top. However the W126 before 1985 and after didn't fit my purpose.

That's when I thought, I design it myself and print it. All arranged according to size and space and - most important - all together. Even the two modern relais from the Bantam aircon will be replaced by "old" Merc relais.

Frame for ALL relais - design ...
Printed Relais holder … 8 "normal" relais ...

As the original case of the cruise control relais has some "ears" for installation, but I wanted to have it closer to the other relais, I designed a new case for it ;-) ...

Case for cruise control relais ...
And the cruise control relais with a new case and proper labeling ...

I don't know about you, but those pin assignments can be quite mind-boggling ;-) … Plug or socket, upside down or not …

So as I do a complete new harness, I did ONE layout now and - hopefully - when connecting all the cables there are no mistakes!

Fully loaded ;-) ...
Pin Layout … ;-)

Shed some light ...

29 February 2019

 

Most of the electrics is behind the glove compartment, mounted on a wooden plate, that can be tilted downwards in the passengers foot room. If I ever have to check something there it will be dark.

So I included a switch (for the wooden plate) and a light cable into the harness. First idea was to buy a cheap LED on Ebay to glue against the firewall (inside), to have some light.

But while fiddling with the glove compartment light, I came up with an idea: This light is still available at Mercedes (4.78 EUR), so why not build a housing and put an "original" light there.

So I started printing and after a test print, the thing fit. Once I have the harness in the car, it will be stuck with double-sided sticky tape onto the firewall and - hopefully - there's enough light to check fuses and relais.

Design of the little box ...
sliding in ...
Prototyping (in white for better reflection) ...
Done!