RE: On-Board glow and RX same battery issue
Good luck!
Using a meter will keep you from "cooking" anything until you have it sorted out.
Now both the receiver and glow driver will present a load to your meter I'm not sure what the ohms reading you will see but there will always be some with the power switch turned on, but the short that cook wires and the switch will be very low, essentially very close to zero. Hope this helps...
By the way I am with Tall Paul it's not a good idea "to put all your eggs in one basket" it is much safer to use two battery's if the glow heads south with one battery you could lose control of the plane, with a separate RX battery worst case if the glow driver fails is a dead stick landing.