There are two things you need to check here: the lighting coil under the flywheel and the regulator/ rectifier. To test the coil under the flywheel you'll need a DVA (see this video on making a cheap one:*https://youtu.be/juhri_NxQcQ) If that coil isn't putting out the specified voltage it is your problem. If it is good connect the regulator/ rectifier again and see what voltage it is putting out. If it is low then it will need replacing. Hope this helps
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