From GameWatcher: “Blair Witch may not be the best horror game ever made as it certainly has its issues, but it’s still a terrifying romp in the woods, and easiest the best game based on the franchise. That said, there are a few tricky moments in the game which may impede your progress, such as the Blair Witch fuse puzzle.”
Source: N4G PC Blair Witch Fuse Puzzle – How to turn on the truck lights