No Power Clicking under dash

Hey guys, I have a 96' 4X4 350 1500. Recently the truck has been choosing the times it wants to have power. Whenever the truck has the juice everything runs perfectly. But some days as soon as I open the door, an immediate clicking from under the dash on the driver side begins. I cant actually see what relay is clicking (if it is a relay that is clicking) but I was wondering if anyone had any advice to give, Thanks Alot!