You can find manuals on CDroms which contain wiring diargrams. These CDroms are played in your desktop computer and pages can be converted back to paper with your printer. Navigating the manual takes practice and is time consuming to find your exact engine/chassis. Be prepared for your engine section to comprise perhaps 50-100 diagrams of different aspects of the engine...i.e. auxillary fan or transmission decellerator circuit etc. Chassis diagrams can easily add 200 more circuits. Also be forewarned that diagram readability of those I've seen is poor at best. Images may have been scanned from poor xerox of a factory manual. But some information is better than none and I am glad to have mine.
1993 MB190e 104k