I've was given a 1984 300sd recently with the best motor 617 I have seen. No blow by quick start and great mpg. But the electrical system is messed up. The radio will turn on and off her and there. The Interior lights work on and off and the windows also. The dash lights act weird and so do the gauges. Any idea guys?

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800