Kelly, I see now where you are coming from, in short, you can turn on the GB TCU without the RX being turned on, with JetCat if the Rx is not on, the TCU is not on even if the power to the TCU is connected.....I can leave my TCU plugged in for a week (although I wouldn't do that of course) and it will not draw any power as long as the RX is turned off.

Ron