I am trying to build a display that shows off a fan that is water proof for automotive use. I have tested it completely submerged with a 14vdc 100amp power supply. It was pulling about 35 amps, normally only pulls about 10. I ran it for about 20 minutes and then it fried. I know this was due to the extra load due to the fan pulling all that water(which it was not designed to do). I need help with choosing an inexpensive resistor or pot that I can use to run this display for one minute intervals. The fan in question is a SPAL VA11-AP7/C-57A.