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Hello my name is ***** ***** I will assist you. The problem you have is with the shift interrupt switch. On the engine where both cables meet, you have a switch the momentarily switches off the engine to help you go out of gear. Check that the switch is working by activating it manually with the engine on, if no then you need to check the wiring or the switch itself that changes polarity when activated.
If you require further assistance let me know.