I've mounted a LED-bar on my Octavia 4x4 2015 but I can't for the life of me figure out which cable to hook up the signal cable for the relay.

 

The instruction says to connect it to the plus cable to the existing full beam, but which color is that?

Anyone have any ideas?

Unfortunately you can't do that with bi-xenons but you can with halogen headlights.

 

If you have bi-xenons then read this thread

 

If you have halogens, then just take the live from the wire to the main beam headlight and feed it to a relay to operate your LED light bar.

 

I've got halogens, do you know which pin/color the live wire is?
I haven't been able to find that information anywhere :(

Xenons atleast have the signal on the  white/yellow cable if you havent testet that yet.

It was the white one... trial by elimination :P

 

For future reference on my Octavia Mk3 (2013) it was the white one (positive) which made it work