I have had the p0380 code for awhile now and have a new glow plug controller to go on. Since it has turned colder here if I dont plug the truck up it wont hardly start. If I dont drive it for a day or two it will not start like the batteries are dead,I jump it off it starts. I had the batteries and the alternator checked it was all good. My question is being that the glow plug relay may be bad is that maybe draining the batteries ??? Any ideas ?