B3030 blows opc fuse &dies while operating. I'm not where the tractor is right now. I'll have to go get it at another

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When you stand up from the seat with the speed control pedal stepped on or the cruise control lever engaged (ON), the engine will stop regardless of whether the machine is moving or not. This is because the tractor is equipped with Operator Presence Control system (OPC).

Tractor engine will not start if the PTO clutch lever is in the engaged "ON" position. A When you stand up from the seat with the PTO clutch lever at "ON" position, the engine will stop regardless of the position of the PTO select lever. This is because the tractor is equipped with Operator Presence Control system (OPC).

There is likely a short either within the wiring or a component in that circuit. Install a same amperage circuit breaker in place of the fuse during troubleshooting to save on fuses. Start disconnecting certain areas of the wiring in that circuit until you find the section that no longer trips the breaker when disconnected. This is when you have isolated the problem area whether it be a short within the wiring or a component that is shorted. It's a pleasure to help anyway I can.