I go to UMR and the circuit provides an "idiot" function for the car, I'm not sure if I should post detailed info about it since it is for a competition and all. I don't think I explained the functionality of this circuit well enough, let me try again. The circuit has a constant 12v running through it but when it recieves a 12v signal it cuts the constant 12v after a timed delay. Also, my problem with multisim wasn't so much that it didn't work but rather it set the timestep to low and was opperating in milliseconds instead of seconds.
edit: the pot would be used in a circuit like this one
http://circuitos.tripod.cl/schem/r84.gif