John Deere 6400 tractor was primarily manufactured in the 1990s; there is no "2021" production model of the 6400 series. If your tractor is from 2021, it is likely a different model (such as a 6M or 6R series), as the 6400 technical diagrams generally refer to units built between 1992 and 1998
High-current protection:
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Tractor Serial Number: _________________________
Date checked: __________________________________
Fuses replaced (type/size): ________________________________
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Aside from the interior panel, there are two critical high-amperage fuses located under the front right side of the cab floor, near the jump-start posts. 80-amp fuse: Protects primary electrical circuits. 160-amp fuse: Heavy-duty circuit protection. Wiring Diagram Review fuse and wiring diagram for 6400 john deere tractor 2021