I HAVE A JOHN DEERE ZERO TURN MOWER MODEL#Z225 MADE IN 2007. I REPLACED THE SOLENOID FOR THE STARTER AND THE IGNITION SWITCH. ALL THE SAFETY SWITCHES WORKED FINE UNTIL I CHANGED OUT THE SOLENOID AND THE IGNITION SWITCH. NOW WHEN I CRANK THE ENGINE AND TRY TO REMOVE THE PARKING BRAKE IT SHUTS THE ENGINE OFF. ALSO IF I TRY TO PULL EITHER ONE OR BOTH OF THE STEERING LEVERS TO THE CENTER OF THE MOWER IT SHUTS OFF THE ENGINE. IF I TRY TO PULL THE PTO BUTTON UP TO ENGAGE THE BLADES WHILE THE ENGINE IS RUNNING IT SHUTS THE ENGINE OFF. I JUST CAN'T SEE ALL OF THE SAFETY SWITCHES GOING OUT AT ONE TIME WHEN THEY ALL WORKED FINE BEFORE I CHANGED OUT THE SOLENOID AND THE IGNITION SWITCH. DO YOU HAVE ANY ADVICE AS TO WHAT THE PROBLEM MIGHT BE?