I didn't want to leave you diesel guys out in the cold just because you guys have 2 batteries and this is less common of a concern. It still can be of concern with all the glow plugs and starter amperage required upon cold starts not to mention most leave their autolamps to on so they come on and draw for the cold start too. So a draw still can be a problem and what a pain it can be. If you have this problem follow my video on how to track down that draw and see where its coming from and eliminate it. These winter temps this year are nothing to mess with. I sure hope this helps it is as simple as it get and is ford specific. Only one change for you diesel guys is take the neg terminal off the other battery so all the draw flow through your multimeter over at the other battery you are jumpered inline to as shown in the video.