Sorry for the late reply. the first generation SV650 charging systems are plagued with two problems: 1. Faulty regulator/rectifiers and insufficient wiring. The entire charging system was wired with 16ga wire when they should have used 12ga. These two problems together create a problem that causes you to have to replace batteries more often than you should, among other things. Only way to truly “fix” it is to use the FH008EB R/R unit from a Honda CBR600RR or CBR1000RR and completely redo all the wiring with the proper gauge of wire.