Electrical cut-out when fan is turned on.

Getting ready to go off-roading this week-end and i took it out for ride this morning. My fan resistor is gone so the fan only works on high.

Anyway when I flipped the switch to turn the blower on high, the whole jeep cut-out. I flipped it back and it came alive again. I stopped the car, and did it while standing still and it cut-out for about a second and then came alive with fan blowing.

I am a little freaked out buy this, so if anybody has any suggestions, it would be appreciated.