Originally Posted by Ranger1
I really don't know but to me sounds like a sticking relay.
Sometimes they heat up and melt a little bit. Then thiongs warp and contacts get stuck on or off. replace it with another one nearby it and swap. mark the one you think is faulty. then test your lights. if they work then you know its the relay.
dont forget about the swap though. you dont want a heater fan going all night.