I have a Z4218 Husqvarna mower. I try to start the mower but the starting switch does not engage to turn the starter motor. I can jump the starter switch out (I have the seat switch jumped out) and manually start the mower, but when I go to release the parking brake the mower motor wants to go dead. Also causes the mower motor to die: 1. engaging mower blades 2. either right or left steering rods moved from neutral positions