05 Headlights coming on themselves Not Started
 

Ok I know this sounds weird but we were sitting at the campground this week, when I looked over at my truck to see my headlights on. No one was in or around the vehicle. We went to turn them off, when we noticed the switch was in the automatic position and the lights were on. The keys were in the camper... but the lights and taillights were shining. turned it to the off position and they went off.. turned it back to auto and they came on.. What would be causing this? the headlight switch or something else?