I need a wiring schematic so I can rewire a Merc. M-500 s/n 5110927.. Some of the wiring is missing and some has been cut.. Also need schematic for ignition switch and choke to motor.. Its my new project boat.. I would like to buy a book on the motor too if I could find one.. Thanks in advance.. Also title say 1979 motor sticker says 1978 if that'll help..