I have a Haynes manual and it doesn't cover my car very well in the electrical wiring departmant (so I think). It stops at 1984 when the manual's front cover says it covers all the way to 1985 (and there are no pages missing). My chassis number is 123.193. The only wire diagram in the manual is for a 1981 300TD 123.193. Are the wiring diagrams for that chassis number the same through 1985?