High Laurent,,
don't be afraid about differencies between your and my config.txt file.

Just add with an editor (use notepad or notepad2 as editor, because it is important that the end-of-line info is written in Linux standard.)

So just run windows notepad and add the lines

#Enable 12v gpio output
gpio=18,12,13,26=op,dh,pu

just ahead of the section [all].

Note that lines beginng with an "#" are commentary lines, so these lines have no effect.

Give it a try, and reboot your Pi4. It will work.

CS,
Helmut
Cologne/Germany

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