Check fuse 5 (FU5) and CA205 wires 1,2,3 on distribution board for battery voltage. if you get voltage check wiring of the keyswitch for damage or faulty keyswitch. if 0v Check Fuse 1 (FU1) and dead man switches for voltage and then check for voltage at forward reverse switches. If you get voltage in all those places trouble shoot SCR.
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