Dead GS500F - Help!

[John Bates]

If the alternator/regulator are working correctly and the fuse and associated wiring are all good then the battery should always be getting a charge, no matter what the rpm.

I made some measurements using a Fluke 77 multimeter:

rpm------amps to ignition----volts at battery
1200-----1.6-------------------15.2
2000-----1.5-------------------15.1
3000-----1.5-------------------14.9
4000-----1.8-------------------14.8
5000-----2.0-------------------14.8

On my bike you can see that the highest charging voltage occurs at the lowest rpm.  But the battery voltage at any rpm is sufficient to fully charge the battery as long as the bike is on for enough time to replace the amp hours lost during starting.