ford 4400 wire diagrams?

Last year I bought a 1968 Ford 4400, with backhoe and loader best work hose I ever had. This winter I started to restore it, but all the 12 volt Wires are gone, the only wires on it are the two from the key to starter and the battery neg and pos. I am looking for a wire diagram for the diesel Eng, and the insterment panel, can any one email(amf49250@live.com) or tell were I can find one without spending loads of money for a shop Manuel? Thanks. R.C. From Michigan.