Dont have the truck running yet but I do have my power running and everything else. My question is this, if I just turn the key on without the truck running will my fan work? last night I turned the key on to do some work to my lights and I noticed that my fan wasn't working. So I thought maybe the truck has to be running for this? wasnt sure and cant start the truck for a bit yet as I still need fliuds and a rad etc...