Yes, now it works!
Thanks to user Freestyle and others for helping me out with this rotating-light issue!
I put a towel in the sirenspeaker pipe to lower the sirensound a bit and it works. But there are now 4 big pieces flashing in the control-unit display to the left.. Has it something to do with siren beeing muffled?? or what?
Lights and siren seems to work fine even with the display flashing.