Thanks for your fast answer!
Now I have connected the Bus-cable from the control-unit to the central control-unit in the lightbar like this:
And my connections to the central control unit looks like this:
But again when I push the light-button to turn on the unit a "zero" comes up under the light-button and the unit beeps about four times and then turns itself off...
Could I have connected the 2 light-beacons wrong (see upper image)??
Or what can the problem
be?