Its rarely the actual rectifier that fails, its the connector. Pull the connector off and examine it carefully, looking for blackened areas or melting. If you can manage it, pull the 5 pins out and give them a gentle pinch up to give them a tighter fit into the rectifier and smear with dielectic grease if you have some handy. While it's off you could also check the continuity between the connector, the stator and the battery.
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