The details nuisance here, have to decide what is actually being monitored to feed a "GEN" light, having worked on a Pantah early this year, the "GEN" light was a feel good light of modest real world value. Most of these "GEN" light output AC RR are really only a voltage threshold indicator, whereas the real fit for purpose GEN light was a cutout relay that indicated the battery was disconnected from the DC GENerator ie no charge current being feed to the battery, as such battery in deficit charge ( usually at idle or high external demand from the vehicle ).
Mentioned prior the real possibility of having an "ammeter" like old pomy cars and 1976 Mazda, fantastic for tech people, real world satisfaction as i motored along and the dash instruments had pointer needles moving all about, +60 -60 amps and i could see the charge current and the discharge when motor stopped and lights on or similar. Measuring Battery voltage is of use, though is no substitute for proper DC monitoring of battery charging/discharging current. Could ramble on for an age on this.... bottom line, voltage monitor is better than nothing though not nearly the feel good factor as an Ammeter can provide, HTH j
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