Living in interior Alaska, I tend to plug the truck in at night during work (mid-shifts), but don't really worry about it at home until the temps start dropping below 20F. I know I won't hurt the engine by plugging in at warmer temps, but I have a complete winterization, with heaters on each side of the oil pan and pads under each battery. My concern is mostly for the batteries. It seems to take awhile longer (up to ten minutes of driving time) for the voltage gauge to read normal after it's plugged in overnight (less than 10 hours) than it does if I leave it unplugged. Am I hurting the batteries? What about the oil? I don't think so, but I'm not an oil man. Understand that I'm talking about outside temps in the 20F-35F range. I don't plug in above 35F, and I usually don't plug in until the truck's been parked 2-3 hours. Thoughts anyone?
-Adam
-Adam