The original MB manual in print is often available on ebay. Mine is the most dog-eared manual I own and I got beat out on one for a bunch of bucks.
They were really poor anyway, but the cars were simple. My wiring diagrams have been missing for 10 years. Again they are so simple I have only had to go to micro fitch info a couple times.
The manual you would look for is the Chassis Manual 108, 109, 111, 113.
Bosch Master, ASE Master, L1
33 years MB technician