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A dash mounted voltmeter can give you immediate notice of a failure of stator, R/R or battery - often sufficient advance warning to get you to a place where you can deal with it before power is insufficient to run electronics, fuel injection and spark.  Due to typically higher Ah capacity, most AGMs will get you further than a lithium battery if you toast your stator. (Disconnecting headlight bulbs will extend range.)


If you are running lots of high draw accessories, a voltmeter will tell you if you are operating in a deficit charging situation.  Not generally an issue with Gen II+ bikes with their higher capacity stator compared to Gen I; especially since most people run LED auxiliary lights instead of power-hungry high power incandescent these days.  I would presume that the Gen IV with all LED lighting would have even more overhead available for accessories.


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