Plurals usage in sentence

Question

I always get confused when I have to use plurals in sentences like the following:

Please specify circuits and boards wirings identifiers.

Is it correct to add the "s" at the end of all of them? Or is there some overuse here?

Answer 1

Here the only plural you need to use is the final one:

Please specify circuit and board wiring identifiers.

As this refers to identifiers for wiring on both circuits and boards.