Could be switch or could be speed coil. In the head of the trolling motor, youll have a red, yellow, blue, and black wires. Leave the black connected and disconnect the other three. With the trolling motor on and set to 5, individually touch each of the red, yellow, and blue wires coming from the lower unit to the red wire coming from the footpedal. The motor should run at 3 different speeds. if it does, either a wire issue from the head to the 5 speed switch, or a 5 speed switch. If it doesnt, then its a speed coil issue. Let me know if I can help.JohnJones Trolling Motor Services870 773 3474Motorguide/MinnKota/PowerPole/Lowrance/Humminbird