I have a 91 S10 BLazer and the electrical is really ****ed up.. I hit the brake lights my digital dash dims out and the lights to the 4 wheel drive and the lights that show the heating swith turn on..And the weirdest thing is that when the lights are off and i turn my left blinker on it looks like i turned my hazards on and when then lights or on the left blinker doesnt blink. i really need alot of help

 

Ihad same problem. First check for ground or short in trailer plugin. Once fixed. Replace aux/trailer fuse, (I think. but find the blown fuse) That fixed mine up. If this dont work, see if any side marker lights, turn signal, or brake lights are blown this could cause a lack of ground for other lights (that theory was told to me)