Pelican has a set online:
Pelican Parts: Porsche 924/944 Electrical Diagrams
Also a parts PET:
Pelican Parts Porsche Parts Diagrams and Locator
A full WSM can be found if you search online. Frowned upon on the forum to provide.
BUT, The best electrical diagrams are on the printed pages of the WSM so you can fold out the sheets and follow the lines.
Protect the DME or plan to buy or repair yours.
Many early owners will just rebuild all electrical lines one by one.
Many will remove the dash to work on the car.
Many grow old in a short time.....
GL
John