After installing the motion and audio modules to a Stug that I am building I carried out a function test and everything was working as advertised. I then installed the recoil module and powered the up again and this time nothing worked.
After a bit of investigation I noted that the receiver was not powered and so nothing worked.
The fix is very simple and all that is required is the red (power) wire removing from the link cable between the audio module and recoil module, with the cable removed everything now works.
The photo below shows the link cable and the removed power wire, just need to insulate and tie the wire away.
Steve