If you don't need a hardcopy manual, you can get PDF format ones (they do require Acrobat Reader 10 or later) from the (UK) 19 set group:
Doc 340
Wireless Set No.19 (Cdn) Installation Instructions for Truck and Ground Station, Sep 1943
Doc 573
Wireless Set No.19 (Cdn) Canadian EMIE Elect L169, Installation Instructions WS19 Truck Utility, Quarter Ton M38-M38A1
Doc 331
Wireless Set No.19 MK II (Cdn) Installation Instructions for WS19 MK II CDN in Armoured Scout Car - Ford Canadian Ref No PC764716-192 Jul 1942
Doc 575
Wireless Set No.19 Mk II Installation Kit M4 Medium Tank 76mm, Parts list & Standard Kit List, Less Tubes and Instruction Book, Comp WS19, PSU & Variometer diagrams, Zenith Radio Corporation
Doc 629
Wireless Set No 19 All Marks (US) Document kit for installation in T26-E1 Pershing heavy tank, 1944
Doc 669
Carrier Universal, Mk I (Canadian) Carrier Universal, Mk1 (Canadian) for use with Wireless Set No. 19, Nov 1942
http://www.royalsignals.org.uk/index.html#info
(Disclaimer: I'm one of the moderators/admins of that group.)
Chris.
p.s. Don't bother with the Pershing since the war in Europe ended before it entered Commonwealth service. There were trials versions only, I believe. (Bovington has one.)