My last fishing trip, my son-in-law was operating the trolling motor from the front of the boat and he said that it just started going where it wanted to. I have a 1999 Motorguide Tracker Series 30 with 37# thrust. Does it have a shear pin or keywAY PIN THAT COULD HAVE SHEARED OR BROKE THAT WOULD CAUSE THIS? Never had this to happen? Where can i get the part? Thanks in advance !