Service Manuals (FSM)
Below are service manuals for the S13/S14 CA18DET/SR20DET chassis. An S13 SR20DET manual in English is said to be impossible to come by. Most people use the S14 SR20DET english manual for motor related issues and the S13 CA18DET english manual for S13 body related issues. The Japanese S13 SR20DET manual is always available for images and diagrams that are crucial.
I have used the OCR feature in Adobe Acrobat Pro to make the English manuals below have the advantage of being text based and therefore searchable.
S13 Fuse Box Translation
SR20 TUNING 