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These old rectifiers tend to ground out and fry. The zener diode is grounded on an aluminum part of your bike, i.e., a finned heat sink, air cleaner housing or a footrest bracket. Adding a solid-state unit is a safer alternative to avoiding fried wires.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.