Trolling motor died on me yesterday. When I hit the button the light on the arrow comes on but that's it. Prop doesn't move nor is there any sound from the lower unit. This leads me to believe the button is ok since the light is coming on. I put a volt meter on it and am getting 24v to the control board and 0 volts on the wires that come out of the control board and run down to the brushes when the button is pressed. I think I've got a bad control board, but before I spend $150 on a non-returnable part I just want to make sure I'm not missing anything else it could be.