Replaced the ignition switch, fuse and fuse assembly, solenoid and brake pedal safety switch. The other safety switches tested ok. Nothing happens when you turn the key to start. It does run when you jump the starter. Any ideas on this electrical problem?
:welcome:
As you have neither read through the 10,000 mower won't start posts already on this site nor supplied any useful information you will get a very generic response.
1) you must always have a complete circuit so both the power + 12 and the ground routes must be clean, corrosion free and tight.
2) the +12V to the solenoid goes from the battery terminal via a fuse to the B terminal on the starter switch which connects to the S terminal on the switch then goes to the PTO switch where it again passes through then goes on to the brake switch again passing through to go to a trigger wire on the starter solenoid and if the ground connection is good to ground through the trigger flipping the solenoid which makes a loud click and if it is working will pass the high current through the thick wires to the starter.
This circuit is a daisy chain so any break in the chain = no start
3) now we have the ignition circuit.
All these wires are ground wires and ultimately ground out the coils TO PREVENT A SPARK.
So to allow the spark to happen all of the safety wires have to be open circuit.
4) Some safety switches have 2 sets of contacts.
Some safety switches are ground only and some are ground & power
If you accidently send power down a coil grounding wire you will fry the coil module.
THE SEAT SWITCH HAS NOTHING TO DO WITH STARTING SO LEAVE IT ALONE
Bert is correct as far as the circuits go. If you can jump the starter and it works, then that end of the circuit is good.
on your ignition switch, there is a B and S terminal. The B terminal will be hot all of the time with battery voltage. when the key is turned to the start position, the S terminal will be hot. this will be either an orange or red wire that will go through the PTO (deck) switch and the brake switch then to the solenoid. If you turn the key to start and check the small red wire at the solenoid, it should be hot. if it is not, it is either a wire or safety switch. If it is hot but not energizing the solenoid, then it is either a bad ground to the solenoid or a bad solenoid. run the mounting bolts in and out a couple of times to clean up the threads. if the solenoid activates but the starter still does not engage, it is a ground issue on the engine. Run a wire (12ga minimum) from the engine to the frame. It should work at this point.
