My trolling motor has been making this very loud squealing noise when I press the accelerator with the speed set anywhere between 1/3 to max speed. It makes this noise while in the water but not when its out. Has anyone ever had this issue and what was the cause/solution? As you can imagine it gets pretty annoying while trying to sneak up on bass or trying to fight current. Thanks in advance for the help!

Here is a video of what it sounds like: http://youtu.be/PVvimPin1Jw