Open the engine cover and there's a black box on the firewall with a smaller black box tucked in next to it.The smaller box contains the glow plug/charge circuit protector. There doesn't appear to be a specific relay for it but I did find a schematic to all the fuse and protector locations -
Kubota M6040 M7040 M8540 M9540 Fuse Box Diagram Fuse Diagram
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