Hello Mr. Tore,
This looks to be a general wiring schematic of U-101 a Type VIIB U-Boat. I have never seen a general wiring schematic for a U-Boat, and most likely never again (very unique)! This will not fill in all the blanks, but it does provide a good base to piece each system into place when ever I can find them. The schematic list U-101 and Blohm & Voss, but U-101 was built by Fried. Krupp - Germaniawerft, Kiel... Interesting?
Do you have any idea as to the cost to copy your schematic? If it were not overly expensive, then I would be willing to reimburse you for your cost, time, and mailing expenses for a copy. They usually put blue prints in a mailing tube for shipment...
Regards,
Don_