Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Do you have a volt/ohm meter to check the continuity between the safety switches? Also check the pto switch. If safety circuit is not complete through the pto switch, the mower will kill engine. There are two circuits on mower, one is for start, it is good, the other is the run circuit, it is open, and is completed by all the safety switches. Wire harness or connections to the safety switches all need to be checked for continuity.
OK, have you ran continuity check between the switches?