Ring Road went up today so I can run in some of my new stock, and inexplicably, the wiring has 'swapped' again. Now this does seem completely impossible, but the only thing I can think of is that somewhere in the terminal block there is a short, which was fooling me into swapping the wires over, and now the short has been resolved, the wires are now in need of swapping back!

A short history:

4 power feeds from the 4 track controller head into a terminal block on board one. From this terminal block, feeds go to the tracks on board one, and to connector plugs that meet connectors from board two that lead directly to the tracks on that side.

A few months ago, mysteriously, the controllers seemed to have swapped, so that the up slow line on board 2 was being controlled by the up fast line on board 1, and vice versa. An investigation found no possible cause, so for a last resort, i simply swapped the feeds to the two tracks on board 1, and it worked!

Now, the controllers have reversed again!

The power feeds and all connectors are colour coded male-female connections so there is no possibility of connecting the wrong one up...

I have a week off later this month, and given its a simple wiring configuration, I think I am going to bite the bullet and rewire from scratch, as I cannot fathom any possible cause for this bizzare wiring behaviour!

David