Hello to all the experts. My question today is when I start up in the morning and it is cold under 40 my voltage goes up to 14 then until the truck warms up it drops down to 11-12 every couple of seconds and comes back up, wondering if this is the grid heater cycling or what? Thanks in advance.

 

Yes its the grid heaters, it will make your lites go a bit dimmer and the defrost fan changes pitch too .

 

THANKS A LOT JUST MAKING SURE IT WAS NOT A (TIC)!