[jakethebt]

Trying to help someone with a 92 K1500 this weekend. The problem is that the head lights will not work until the truck heats up. I have limited info at this time, but being told that once it heats up, they come on. So this lends me to believe that the problem is inside the truck some where. I am thinking thermal expansion, when the wire gets hot the short completes and the circuit? He said that he had this issue a few years ago and replaced the switch but that did not fix the issue. Any ideas of where to start? I am still thinking about starting with the switch. Maybe start with a multi meter and keep looking for where there is power? Since they are both out, start looking for the issue where the power is common for both R and L. Is there any place that i can find a wiring diagram?