Ok guys i know this is a topic that has been neat to death, but my 01 7.3 has a hell of a time starting when its cold, I have installed a new GPR and tested it with a Voltmeter and everythnig checks out but i was wanting to know what else i got to do to be able to leave my truck unplugged when it -5 to 20 degree's outside since i am going to college i am in class for 4-5 hours at a time and really dont want to have to deal with it after school any help would be great please and thank you....if you guys have any questions for me to help me figure this out please dont hesitate.