Thank you all.
I was not able to open the link provided by Steve. when I looked myself previously I could not see the 25811 which is the loco I have, so I continued to search the web. I suspect that the diagram (21811) at the the links provided by Steve and the DR are all there is publicly available. Possibly because the later locos were manafactured after marklin took control (mine has a Marklin sticker on it). Anyway thank you again the 21811 diagram wil be a great help.