Welcome to the forum.
First, do you know for sure that your "arctic package" (not being critical or a smart a** as many make the same mistake but it is ARC
TIC and not "artic") includes electrical pads on the tanks ...or what I'm assuming you mean when referring to "heaters" ...??
There are some manufacturers that might not use any electrical heating at all. An arctic package could include only pipe insulation, underbelly insulation, double pane windows, insulated sashes, general beefed-up insulation in walls/roof, some other manner of heating the holding tanks etc. or some combination but no electrical tank heaters at all. Some manufacturers will make sure the tanks are enclosed and included in the circulation of basement heat provided by the furnace and if so, will usually not need electrical heating pads on the tanks.
So do you know for sure that you have electrical pads on the tanks? If you do have heating pads, there should be a switch somewhere in the interior that is usually a red rocker switch and almost always will have a red indicator light to show when the pads are on. It could be next to the water heater switch, or somewhere in the panel where you have other operational switches. I've heard that some heated tanks do not even have a switch but are controlled by a thermostat. So as a starting point, you'll have to determine what your coach has.
If there are no others chiming in during the next day or two who have a Gulfstream coach with an arctic package that can tell you if you do in fact have heating pads and if so, where the switch is located if there is one, I will ask a moderator to move this thread to the iRV2 Gulf Stream Owner's Forum (HERE
) and perhaps somebody who has the same coach will be able to help you further.