It's very important to have a known good and the new switch should be your starting point. Do you have a meter to test the parts? In an earlier post, I wasn't very clear about something, involving the brushes. The commutator can become dirty, due to brush wear and cause a DC motor, to not run. It's worse at lower speeds. I have a variable speed MG and it no longer turns in the water on the lower settings but still moves the boat 2.5 MPH on the GPS. It would run 2.6 MPH, when brand new. Water and wind conditiona are close to same. I still have my same top speed and lower peeds but my range has narrowed, meaning a little movement on the speed dial, changes the speed, much more than it did, when new but is still easy to live with. I may be wrong but think your issue, is the same as mine but my variable speed enables me to power it past the dead motor's dead zone and dial it back to a place it wouldn't start from. Your click settings kill power in between them, causing you to lose the ability to get it going on high, then dial back to 1 or 2. a bad or going bad bearing in the motor can cause low speed problems. a little water in the motor can go a long way, as well. The motor isn't something that you kill, if you open it. It's designed to be repaired and in some ways, serviced. Not trying to confuse or say, you're looking at the wrong end but just trying to plant seeds of thought. good luck
