Mower wont start

Look for a corroded or loose wiring connection.

Search for a consumed or free wiring association.
clean the entirety of your capacity link connectors, use oil in every connector.

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Have john deer Z225 EZtrak Has 18.5 hp briggs 0146-G1, mower won't crank , have replace ingnition coil ,tested bad new coil test 10.31 across , replace sollenoid , starter check good . fuses are good , new switch , yesterday went from battery to starter direct with key in run position , started and ran , today will spin but now no fire ,replace plug still no fire , re gaped coil ,no help. at wits end , any help would be appreciated. tomorrow if not raining will pull switch and test it, it's new but still could be bad.   turn Key to start position no noise, been a while since i ran the valves , but don't think that would keep it from firing, will be looking at switches next, would help if I had good wiring diagram  Thanks in Advance , Art

It sounds like you've already taken some proactive steps in troubleshooting your mower's starting issue, but I understand the frustration of still encountering problems. From your description, it seems like there might be an issue with the electrical connection or the starter itself.
Here are a few additional steps you could consider:

1. Check Wiring Connections: Ensure all wiring connections, especially those related to the starter, solenoid, and ignition, are securely connected and free from corrosion. Loose or corroded connections can prevent proper electrical flow, leading to starting issues.
   
2. Test Starter Relay/Solenoid: Even though you've replaced the solenoid, it's worth double-checking its functionality. Use a multimeter to test if the solenoid is receiving power from the ignition switch when you turn the key. If there's power but the starter isn't engaging, the solenoid might be faulty or improperly installed.
   
3. Inspect Starter Motor: If the starter motor isn't receiving power from the solenoid when you turn the key, there could be an issue with the ignition switch or wiring. Additionally, check the starter motor itself for any signs of damage or wear that might be preventing it from engaging properly.
   
4. Voltage Drop Test: Perform a voltage drop test on the cables between the battery, solenoid, and starter to identify any excessive resistance that could be hindering the flow of electricity. High resistance can cause voltage drops, resulting in insufficient power reaching the starter.
   
5. Consult Manual or Professional: If you have access to the mower's manual, refer to the troubleshooting section for specific guidance on starting issues. If the problem persists despite your efforts, consider consulting a professional mechanic or technician who specializes in small engines or robotic mowers. They may have the expertise and tools to diagnose and resolve the issue more effectively.
   

I hope these suggestions help you pinpoint and resolve the starting problem with your riding mower. Don't hesitate to reach out if you have any further questions or need assistance. Good luck!