[petek]

Tim,

Looks like you've got this stuff figured out! The way to find a current draw is to do what you did, remove fuses and see what happens.

(Great description of the fan electrics, Jack.)

A bad voltage regulator would explain why the battery went dead and maybe explain the fuse blowing. If the regulator was shot it wouldn't be out of the ordinary for the electrical system to go to say 16 volts or so. Greater the voltage, the greater the current to the fan (resistance staying constant).

I'd replace the v-reg and go with a 25 amp fuse and see if everything works out.