I have a snow plow mounted on a truck I just purchased. They told me the plow works great. The plow does move side to side very well. It seems like there is some type of pin somewhere preventing it from raising ? I went over all the wires and connections. I read a sticker on the plow that states "safety pin must be installed when not in use to prevent plow from dropping while driving". I have no idea where this pin would be?