Hello and welcome Mathias!
First of all, I don't mean it in a bad way.
The electrics are completely in order from the factory and work perfectly. It is very well documented (colored circuit diagram with pictures, it couldn't be easier

) and sufficiently dimensioned.

Colored cables, colored connectors and a
wiring diagram example. Yes, not all plans are in color, but they are usually very easy to understand.

In the second picture is my dashboard
wiring harness and the so-called main wiring harness from a
Zetor 5011 from 1984. I don't find that bad or confusing.
The Zetor's electrical system only becomes bad when owners mess with it even though they have no idea what they are doing. New cables are being pulled in wildly, without doing the math, additional lamps, radios and sockets are hung on possibly exhausted cables.
I always repair Zetor tractors like this, believe me, the misery always starts with the ignorance of the person working on them.
But there are people who are born racing drivers, or the best farmer, or even electricians. But there are also people who don't know how to work with electricity because they haven't yet understood the logic behind it - and they should better seek
help so that they don't do more harm than good on their own.
And that's exactly why this forum exists here. Here you can get advice and then avoid certain beginner mistakes.
So if you have any questions - including about the electrical system - you can ask them here.
Please always do so so that we have a chance to help, i.e. with photos or good explanations of the problem. Then there is quick help.