Originally Posted by
Lappa
If it has five wires, then the wiring diagram is wrong:( The black wires are all to do with the ignition kill circuit. According to the diagram Pete gave the link to, the red wire goes from the charging system regulator up to A1 on the ignition switch and the wire to the fuel cut solenoid is blue? There should be an orange wire, joined to the red and blue going to A2 on the ignition switch. Have a look at the diagram which shows the back of the ignition switch and compare wire colours to yours. The fuel cut solenoid, if it goes into the carby body, is used to cut off the fuel circuit in the carby when the ignition is switched off to prevent the engine "running on" when the engine is switched off.
if you wanted to bypass the safety switches, but I'm not recommending it, you could disconnect the black wire from the ignition unit and the "m" terminal on the ignition switch, then run connect a wire from the ignition unit straight back to the ignition switch "m" terminal. This would allow you to start and stop the mower normally but all the safety switches would be bypassed.