ESR290 is a modern high quality regulator/rectifier that replaces the outdated OEM part on (all non-fuel injected) Honda GL Goldwing models. We designed a new internal circuit that keeps output voltage very stable and we installed it in a modern heat sink design. This ESR290 offers a very stable output voltage across the battery terminals across the RPM range and stays much cooler than the OEM part therefore providing superior reliability. Your Goldwing's accessories need a stable voltage which our regulator/rectifier provides. ESR290 is a plug in replacement and it comes with a full one year warranty.