Wiring questions

I'm trying to reconnect all wires of my 79 t2 but a few things are not clear to me:
1 dashboard: is this correct?


2: light switch what is the 2nd red wire for?


3: connector under dashboard: what is the brown-white wire for?

4: relaislookalike thing wired to indicator relais. Does domeone know what this could be? There's a sticker with a nr 910 018 on it. Maybe part of an alarm?

 

4. Maybe a relay to power trailer indicator lights?

 

If you download a colour wiring diagram from http://vintagebus.com, all will be revealed

 

Number 3 might be for the interior light switch in the a pillars