Welcome to the site.Why do you think you need to replace the wiring harness? If you haven't already un-plugged & re-plugged all the connections that's a starting point. Making sure that the wiring harness is grounded to the motor & chassis is nearly always the culprit, unless the wiring shows signs of arcing/burnt plugs. Is the carb leaking from the bowl gasket, the over flow, into the airbox?
Is there a neutral safety associated with this buggy-ie... pushing the brake pedal to start?
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