Hi John,
I am afraid I do not have a wiring diagram for the EKA, but can offer a bit of info. I did a lot of the repair work on the Scammell EKA 66GT67, during its service with 44 Dist Wksp and recall having to renew the pump unit for bogie blocking. The new one supplied under a NSN was of a different make to the original and a few small mods were made in order to fit it. the new one was a Hesselman pump made in Sweden by Garphyttan and designed to operate a truck tail-lift. I have a small booklet that came with it on service and maintenance, but unfortunately there is no mention of the wiring connections.
regards, Richard