Recheck all the wires in the pedal. Using needle nose pliers grab each wire near where it is soldered and try to shake it. What happens over time the wires get hard and brittle. Just looking at them they appear to be connected but when you shake them you can find the bad connection at lot easier. And yes you should have a circuit breaker on the TM's positive lead as close to the battery as possible. Idealy 6 gauge wire should be used from the batterys to the TM but 8 gauge is acceptable for a 24V motor.