Hey friends, I live in northern Montana so it is cold here 5 months of the year! I do have a engine block heater, but I wont be able to plug it in when I'm hunting or at work for 10 hours. So I think it would be essential. I was wanting to know if anyone has ever used a grid heater on their 4BT? How would I wire in the relays to the computer? or should I use a switch to heat it up then turn it off? Thanks for your two cents!