During a recent fishing trip I lost my high speed ( 4 - 5) on my Minn Kota 70 lb edge. I have replaced the speed coil and speeds 1 - 3 work fine. I removed the red wire and the motor continue to run. I removed the yellow and white and the motor stop running. In all my research, I believe the problem is the red wire is worn or not connect to the back of the Brush Plate. If I remove the armature to get at the brush plate how difficult is it to replace. I read that it is a real problem to replace. I am I on the right track or is there something else I should do? Any help will be greatly appreciated.