Alright guys i need some help on this one. I have a 1992 Chevy 1500. My lights and turn signals all work good until i turn on my headlights or even just driving lights. My left turn signal stops working and also my left brake light. im not sure if the tail light itself goes out too or not but its only the left side and only when my lights are on...any ideas?

 

It sounds like your light switch has created a short in it. Or there is a positive short in the dash.

 

Where should i start looking for shorts and how do i know when ive found one?