... a relay rather than solid state to change the polarity. The first picture shows the Autofrog first wiring up with a Wago plug stuck to the top as they don't come with proper terminals, just three solder pads, hence the need for something to make them unpluggable! The next shows one installed on the layout. Not a neat job but I've got it colour coded and I think with the records I've now got I should be able to understand it in a few years time when all this is but a distant memory! 2787_101852_190000000.jpg Kind regards Andrew posted: 11 Sep 2018 08:25 from: madscientist As an idea for future builds, why not create an electronics/ wiring duct, in our case( club O gauge layout, based on the GWR direct line), designed by yours truelh, you can see the frog juicers n place, it's much more crowed now with the Merg cobalt controls and other boards, but I don't have a recent pic. The green boards are tam valley frog juicers the red ones are my own design DCC ...