I have attached wiring schematics for you to review. My concern is they are very detailed and may be hard to read. The second picture has the glow plug relay info and I see the wires you are refering to because I can enlarge the schematic. If you are unable to and can't read it, let me know and I can tell you where everything is going.
From what I see, there is a black/orange wire that runs from a fuseable link (hot all times)to the glow plug relay (it also powers the intake air heater when the relay is actuated). From what I can see, it looks like the relay itself may be bad and allowing power to continue to both relays. NOTE: The black/orange wire is the power supply. Without being there, my guess is you are seeing a constant drain from the red wire. However, either relay that I mentioned could cause that problem. From what I can see from the schematic, they are the same type relay. Remove one at a time to see if the drain stops. If it does, try another relay of the same part number to see if the draw stops.
Let me know if you have other questions. I hope this helps, but it is hard to explaine a schematic via the internet.
Images (Click to enlarge)
Thursday, March 10th, 2011 AT 4:55 AM