After 15 Mins. of driving the headlights start to flash on and off. I tried replacing the light switch with no luck. Two different mechanics have no idea whats wrong! There's got to be someone out there who knows how to fix this. It's a Ford Ranger Splash, 4.0L 6cyl. extended cab short bed 4x4. I did have a lighted moonvisor installed, but had no problems until several years after installation.