Hi Christopher,
This "converter" you talk about - I'm not quite sure of my understanding of your thread, but:

Does this converter convert the signals from the towing car's plug into a "simpler" one for the trailer?

Better to explain my question in another way:

I have severel cars and actually made a little collection af small vintage trailers too over the years.
In Denmark, Europe, the plug between a car and a trailer must at least have 7 connections - a single one for each turnsignal, brakelight and so.
My problem is then, on some of my very old trailers, ex. 1956, original taillights did not have brake and turn seperated and I would very much keep them that way!
So - what I need is somekind of converter that allows incoming turnsignal and brake - but gives brakelight on one side and let the turnsignal overrule on the other side.

Hope I make myself understanable!

If so, where can I find that converter?

Thanks a lot!

/Soren