I have a Gaugemaster CDU but none of the connections are identified.

Presumably, there are 2 inputs and 2 outputs but which is which ?  Does it in fact, matter ?  Were they originally marked or not ?

The connections are just in an unmarked block of 4 terminals ……………………..

Help please ……………..

 

I think I've found the answer - on an American site !!!!

I still have one of those.  Hope of connecting it correctly was abandoned when I couldn't find any sort of identification for the terminals nor wiring diagrams.  It may have helped also that I use Morley controllers which have a built-in CDU although beware of accidentally creating a short back to the controller.  The CDU shares some of the wiring inside and I managed to blow up the controller for "Track 3" on the first such item by shorting out across a double-slip and which promptly burned out the CDU as well.  Lucky they also come with a 10-year guarantee!