Hi gang. I am having trouble with rear defrost on my 2005 unlimited hardtop. I have been all over the wiring and grid. I changed the relay under the hood which looked like it had been hot. No change. Should I have power to both wires that plug to the grid? Is the right side a ground? I only have power to the left side. Switch is OK, My service manual does not have good wiring diagram for the defrost. Thanks Unlimited jeep guy.