This engine heater harness supplies power to the block heater, keeping the engine coolant warm for reliable cold-start performance. It connects the tractor's electrical system to the heating element mounted on the engine block. A damaged or corroded harness interrupts current flow, preventing the heater from operating and increasing the risk of hard starting or no-start in low temperatures. This original AGCO harness uses the correct wire gauge and connector geometry to match the factory engine-loom interface, so no splicing or adapter is needed. On installation, verify the connector seats fully and that the harness is routed away from exhaust components and moving belts.