I thought I had seen/read something in regards to installing tunes. I know that the battery has to be fully charged if not run a trickle charge to make it even better. But what about outside temperature? I should have the tuner this week and at least the weather has warmed up above zero, into the low 20's at night, mid 30's during the day.

Is it safer to wait to a certain temperature?

 

Running your truck for 15-20 minutes before a programming session will help to warm things up.....then while flashing the vehicle have the engine off and key on......