You have to trace it back from the batteries. After the batteries, test the TM plug and then see if you have power at the foot pedal switch and then next in the top of the motor. I had this happen a few years back on an older OMC trolling motor and I had good batteries, power at the plug, the foot pedal switch, and in the top of the motor. Ended up taking the motor apart on the lower end and one of the contact wires had broken. Soldered the wire and put it back together and it is still going strong...

kc