I have a Minnkota Riptide ST,24v,80lb trolling motor. The problem is the prop wont turn until I reach #7 or higher on the power scale.All speeds below (1-6) dont work.I took the I pilot out and put the co-pilot in to see if it was a hand held issue and still have the same problem.Called minnkota,they never heard of an issue like this of course it just went out of warranty last month.Any ideas from anybody as to what my problem may be? Thanks in advance