Sound more like its a compination. If the resistor thing goes bad it won't cause the switch to get stuck only in one spot. That spot being high in this instance. And now he can move it to two spots. the resistor has probably gone bad and what I am sayin. Both are quite the easy fix.

95 SES Sold 99 SE Sport Sold 99 SVT T-Red Tan Interior. K&N, Magnecors, 19' Theorys, And some audio stuff.