93' sl500 electric problems

I've got a few el problems in my 93 sl500. The steering wheel adjustments are not working. When opening/closing the soft top only right window goes down (both work fine on the switch). Side mirrors are not working. Bad contact somewhere for the A/C panel light. Window wiper also seems to have a bad contact; it stops all over and rarely where it's supposed to (it's electric and not mechanic, it's worse in intervals than continously, I don't think there's a rain sensor?). The fuses in the boxes in the engine and the trunk are ok. I also found one box below to the steering wheel but they were also intact. And last but not least, it overheats going uphill and slow traffic, I live in southern Spain but this is too much. Apart from these small things I love driving this car. Going 260km/h is good fun!! Hopefully somebody has some suggestions for me and they are received with great thanks.