OK. Here's the problem I had on my 84 200sx. My brother (big mistake) was changing out the alternator on the car without my supervision and hooked up the alternator wrong. No big sparks or anything but of course the car would not start. I found the problem right away and corrected it. The battery ended up being dead, so I replaced it. The car starts with no problems but about half or most of the electronic stuff is not working. The few things that work are the windshield wipers and the headlight motors. A long list of other things that does not work include the headlights themselves, brake lights, signal lights, hazard lights, horn, stereo, interior overhead light, guages,and just about anything else you can think of. The car is driveable but not legal without the signal and brake lights. Does anyone know where I can begin to look for any problems. I checked the basics like the fuses and any damaged wires. None of the wires look cooked and no blown fuses. Where else could I look or what normally goes out when the alternator is incorrectly connected. Any help would be appreciated.