Demo/legacy repair — real data lives at cases posted by signed-in technicians.
John Deere 644K loader — no-crank, main relay clicks once
John Deere 644K Loader · John Deere PowerTech 9.0L
AI Summary
Similar cases point to ground strap corrosion at chassis (44%) or a failing starter solenoid (31%). Voltage drop test recommended before parts.
Symptoms
No crank. Master relay clicks once, then silence. Batteries load-test OK.