I found it. It was hiding in plain site. I was looking under the truck, it was behind the bumper with a zip tie holding it down. The end of the cap is round, so I originally thought it was a temp sensor. I have alot to learn with this thing. For openers, acc. on ignition is 1 click up, not one click down. The volume of the stereo goes up and down according to road speed. If you turn the key to start before the engine feels like its ready to start [glow plug?] the key simply comes back, and then it starts itself. When its ready. When you use the remote entry or punch in the numbers on the door keypad, if its dark, the lights come on. Until the key is in the ignition. Even if you have the sentinal feature off. The interior overhead lights gradually "fade" off, they don't just go off. The truck is over-badged to a fault. Giant Ford Superduty logo's front and rear, stamped into the grill, tailgate, its on the windshield. Also both fenders, dashboard, and door sills. over kill IMO.