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 a simler problem. First check your trailer plug in, near the hitch make sure nothing is grounded (or shorted)that shount be, then replace the park light, and trailer lights fuse and see if this helps. That what the problem for me.