Tore, thanks.
I think, that 1 is for connecting some equipment for testing electric torpedoes. Why only in aft torpedo room? I have found, that there was low voltage motor testing gear, which consisted of acid-lead battery. I believe, that panel 1 was used to charging this battery.
2 - Endlageschalter - limit switch for electric motor driving main rudder
3 - Wiederstande - starting and breaking resistors for motor
4 - G7e Heizschaltkasten - G7e torpedoes heating panels
5 - E komassumf (former) - rotary converter for gyro compass
6 - Wiederstande - starting and breaking resistors for aft diving planes motor
7 - Endlageschalter - limit switch for aft diving planes motor
8 - something related with G7e torpedoes
9 - Senderum (former) - rotary converter for radio transmitter
I will have more questions, when investigating remaining parts of drawing.
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Thanks, regards
Maciek