If the fuse is good but lights won't turn on, the specific lighting relay (found near the fuse box) may have failed. Blown Fuses Repeating
Switched ignition power (only "hot" when the key is on). fuse and wiring diagram for 6400 john deere tractor 2021
The primary fuse box on the John Deere 6400 is located inside the cab, positioned on the right-hand console or beneath the steering column dashboard panel, protected by a plastic cover. Fuse Panel Schematic Fuse Number Amperage Rating Protected Circuit / Components Instrument Cluster, Digital Display, Warning Lights F2 Turn Signals, Hazard Flasher Unit F3 Horn, Dome Light, Diagnostic Connector F4 Front Work Lights, High-Beam Headlights F5 Rear Work Lights F6 Windshield Wiper Motor (Front and Rear) F7 Cabin Blower Motor / HVAC Climate Control F8 Radio, Auxiliary Power Outlet / Cigarette Lighter F9 Stop Lights, Tail Lights F10 Fuel Shutoff Solenoid, Cold Start Advance F11 Electro-Hydraulic Hitch (EHR) Controls F12 Four-Wheel Drive (4WD) Engagement Solenoid F13 Power Take-Off (PTO) Switch and Solenoid F14 Transmission Control Unit (TCU) Memory Power Maxi-Fuses and Fusible Links If the fuse is good but lights won't
Frayed insulation caused by rubbing against sharp metal chassis edges. Fuse Panel Schematic Fuse Number Amperage Rating Protected