The first place you want to start is in the fuse panel marked "C1"
According the diagram, putting the key to the first or any other position will send power to the rheostat (fan speed swich) on the third page.
have your volt meter, and a flashlight handy as well as a good looking massage therapist =) pull the fuse for C1, It's under the dash, there's 3 or 4 little boxes with caps on them, it's one of the black 2 one's with a cap on them (from memory)
Pull C1, then turn the key to position 1 or 2, and verify that there is 12v.
From there, if you have power, if you are still no bueno - you can jump the fan with an external 12v. source (another battery) in the C1 port. Just make sure the fan speed swich is on.
If it STILL dosen't jump, go buy a 6-pack & get ready to pull your clam, you'll have to call lotus to order the regulator which is in the worst possible place in the car =( . . .