1992 300 SL questions

[medic0749]

Hey everybody - I'm looking at buying a 92 300 SL that has been sitting for a couple of years with 87K miles on it. I had to jump start it as the battery was dead and drove it down the road a couple of miles. While driving the car just died on me. It then started right up. throughout the entire time I drove it I found the following issues that I think may all be related but cannot find the cause for. The dash board instrument cluster is basically dead, none of the gauges work except for the trip odometer (speedo does not) and the temp gauge, all of the rest are dead. The back lighting works on the dash and the turn signal turns on but doesn't blink and won't shut off after making a turn. The power windows do not work, the locks do work, the radio resets to 87.7 when car is turned off, the fan does not work for heat or A/C. Interior lights work, headlights work. Otherwise the car runs great, drives great and handles well. I'd like to buy it but not sure what is wrong and where to start looking other than fuses which were all good. Any help would be great.

thanks