Originally Posted by TheDurk

You were doing fine until you got to the bold. Thing is, the main starter power on our trucks, like most all vehicles, has no fuse. The fused circuit, to the solenoid, is only energized when the key is turned. The only key-off drain possible in that circuit is from the relay itself, so the way to test that is pull the relay. If the relay is working properly, no current can pass it unless the key is turned to the START position, so no current drain can occur when the car is off.

In general, a parasitic drain through the starter itself would be a very big surprise. If it ever happened, I doubt it would last long, as the tendency would be to lock up with the starter always running or lock up so that it would not run at all. The main current is just too large to enable a stable parasitic drain. If you can't find the leak through the fuse testing described, the alternator is the likely suspect.

Circuit diagram follows:

http://www.teamtoyota4x4.org/archivi...mci/013sis.pdf

It's for 2002, but the relevant parts are similar for all years.