would like to retrofit an alarm system, as the serial system is easy to outsmart.
Now I need terminal 30 permanently 12volt and terminal 15 connected plus.
Do I find all this in the passenger footroom or do I have to go directly to the battery and switched plus (terminal 15) to the ignition lock for Dauerplus (terminal 30)?
Or I find everything at the ignition lock again.Of course that would be best.
I don't want to be in the passenger's footroom.
There are just too many cables

Another question about the door contact switch.
It's just the mass that's being switched on?
Just ask me, since my old 90s a cable arrived at the switch and I think I can remember that there are two cables at the door contact switch.
Would be nice if you could help me out there, so that I don't spend too long in the cable salad.
Greetings Daniel M.