 input side of that and there'll be a power wire coming into that we'll check between that power wire and ground make sure we have power there and we just keep moving backwards that's a what they call a pulse width modulated system with that auto automated temp control so you'll have a power and ground going to that blower module under the dash you'll have power and ground going to the blower itself and then they've just got a trigger wire that comes down from the control and it just turns on and off and the more