Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! The seat switch , brake switch and pto switch all have to complete the run circuit. Have you checked the seat switch and harness? The mower thinks there is no one on the seat, when the brake is released. Can be switch, harness, or other wires that have to make the run circuit complete.
I see no wiring diagram for the unit, and the parts list shows the three switches, seat, brake and pto switch. They all are in the run circuit, so do a continuity check between the switches . And take a good look at the seat bypass, it may have come loose! The safety switches complete the ground side of the circuit.