What do you want for the S2? Any of these any good to you?
Series IIA Positive Wiring
http://www.roversclub.org/docs/2A_petrol_pos.pdf
FFR Series
http://www.roversclub.org/docs/FFRseries2.pdf
Land Rover Series II FFR user handbook-PDF
http://www.landrover.ee/est/files/manuals/cars/sII/FFRseries2.pdf
Early S-IIA negative earth pertol electrical system (Color) -PDF
http://www.landrover.ee/est/files/manuals/electricity/IIa_early_neg_petrol.PDF
Military User Handbook, FFR
http://www.4x4info.info/TECH/SERIESII/FFRseries2.pdf
Series 2 Instruction Manual
http://www.4x4info.info/TECH/SERIESII/Instruction Manual.pdf
Series 2 Index to Sections,
http://www.4x4info.info/TECH/SERIESII/Index To Sections.pdf
Series 2 Index to workshop manual,
http://www.4x4info.info/TECH/SERIESII/Part 1 Index.pdf
S2a Workshop Manual 2.25 petrol engine,
http://www.4x4info.info/TECH/SERIESII/Section A1 - 2¼ Litre Petrol Engine.pdf
S2a Workshop Manual 2.25 diesel engine,
http://www.4x4info.info/TECH/SERIESII/Section A2 - 2¼ Litre Diesel Engine.pdf
S2a Workshop Manual 2.6 petrol engine,
http://www.4x4info.info/TECH/SERIESII/Section A3 - 26 Litre Petrol Engine.pdf
S2a Workshop Manual Clutch units,
http://www.4x4info.info/TECH/SERIESII/Section B - Clutch Units.pdf
S2a Workshop Manual Gearbox,
http://www.4x4info.info/TECH/SERIESII/Section C - Gearbox.pdf
S2a Workshop Manual Propeller shafts.
http://www.4x4info.info/TECH/SERIESII/Section D - Propellor Shafts.pdf
Series 2 Electrics - 4cyl fwd ctrl
http://www.4x4info.info/TECH/electricity/SII_4_fwdcntlr-ve.pdf
Series 2 Electrics - 6cyl fwd ctrl 1
http://www.4x4info.info/TECH/electricity/SII_6_fwdcntlr-ve.pdf
Series 2 Electrics - 6cyl fwd ctrl 2
http://www.4x4info.info/TECH/electricity/SII_6_ltinwings.pdf
Series 2 Electrics - -ve fwd ctrl diesel
http://www.4x4info.info/TECH/electricity/SII_d_fwdcntl-ve.pdf
Series 2 Electrics - -ve fwd ctrl
http://www.4x4info.info/TECH/electricity/SII_fwdcntlr-ve.pdf
Series 2 Electrics - +ve fwd ctrl
http://www.4x4info.info/TECH/electricity/sii+ve_fwdcnt.pdf
Series 2 Electrics - s2a +ve d
http://www.4x4info.info/TECH/electricity/siia+ve_d.pdf
Series 2 Electrics - s2a +ve diesel
http://www.4x4info.info/TECH/electricity/siia+ve_diesel.pdf
Series 2 Electrics - s2a -ve diesel 1
http://www.4x4info.info/TECH/electricity/SIIa-ve_diesel.pdf
Series 2 Electrics - s2a -ve diesel 2
http://www.4x4info.info/TECH/electricity/SIIa-ve_ltinwing.pdf
Series 2 Electrics - s2a -ve diesel 3
http://www.4x4info.info/TECH/electricity/SIIa-ve_ltinwing_D.pdf
Series 2 Electrics - s2a -ve petrol
http://www.4x4info.info/TECH/electricity/SIIa-ve_petrol.pdf
Series 2 Electrics - s2a -ve trailer
http://www.4x4info.info/TECH/electricity/siia-ve_trailer.pdf
Series 2 Electrics - s2 -ve
http://www.4x4info.info/TECH/electricity/SII-ve.pdf
Series 2 Electrics - s2a +ve petrol
http://www.4x4info.info/TECH/electricity/s11a+ve_petrol.pdf
Series 2 Electrics - s2a early -ve petrol
http://www.4x4info.info/TECH/electricity/IIa_early_neg_petrol.pdf
LR Optional Parts Catalogue (PDF)
http://www.fourfold.org/LR_FAQ/Series/images/lroptions.pdf
Havent catalogued any more that are S" specific yet; but penty of the ;accessory' or 'engine' or 'transmission' supliments in and about are pertinant to some S2 models.
But, on the whole yes, tend to agree, most stuff about does seem to be S3 orientated.