... in a moment of where I think they could be and if you have an opinion I wonder if you'd explain in simple non electronic language the logic please! Many thanks Andrew Last edited on 22 Apr 2020 20:06 by Andrew Duncan posted: 22 Apr 2020 20:27 from: Andrew Duncan Here are 4 areas/ joins in the wiring that I think are the most likely candidates The DIN sockets and the switches. Out of these two the switches seem weakest as the dins are good quality and a tight fit? 2787_221514_010000000.jpg The rear of the above 2787_221517_520000000.jpg The three districts all go through this choc block strip. Here I'm using 16/0.2 flex, and for some short feeds from here to the rails (length 15" max) I'll go down to 7/0.2 flex. 2787_221519_130000000.jpg Ideas gratefully received Thank you Andrew posted: 23 Apr 2020 05:09 from: Andrew Barrowman Hi Andrew, Your wiring looks good. If the district that's giving you the problem is not the furthest from the power supply it's more likely a suspect district ...