That sounds to me that you do not have proper ground connections. Can you tell us more what has been done on the car?
I would return the car to the shop and ask them to rectify this problem.
As for the steering: there is a large nut close to the pedals. Maybe this just has to be adjusted.
http://shrubbery.student.utwente.nl/...djustment.html
The steering gear box can also be adjusted. Go to my page and then see the link to Bruno's page, there are the details. Also on Johan's page (see above link) there are a lot of further info.
Maybe some of the electric wizzards here can comment a bit more on the power problem.
Maybe it is the main fuse, see some info on the page of O.J. on my website. That sits under the rear seat. But not in the fuse box under the rear seats.