I had my car towed by a mechanic to have the.

I had my car towed by a mechanic to have the clutch replaced. He towed it back, started it, backed it off the dolly and then drove it to where he parked it. It started smoking and he shut it off. It hasn't turned on since. By "hasn't turned on" I mean you turn the ignition and nothing comes on. No head lights, no tail lights, no radio, no dash, no power. I managed to trace the power from the battery to a small switch looking deal right before the firewall. There is a red wire secured by a nut and then an orange wire comes out the other side and goes into a black box on the firewall. I've traced 12 volts to that red/orange wire. After that on the inside of the car I'm getting 0.03 and it's not consistent. It will be there and i'll go to test it again and won't get the same results. I checked the fuses and they all appear good. I just need to know what to look for and exactly how to do it because I'm 34 weeks pregnant and the six mechanics I've called to come look at my only mode of transportation obviously don't see the importance in me getting this done.