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Keep in mind that 12.6 volts is the normal reading for a charged battery.
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The reading of a charged AGM sealed battery is 12.8 volts.

The charging system on these bikes is quite capable of keeping the battery fully charged.

To upgrade the system you have to increase the wire size from the regulator/rectifier to the battery.

My bike was reading 12.9 volts at the battery at 2000 rpm. After replacing the wire from the regulator with a heavier guage it now reads 13.8 volts.

Simple, easy and cheap fix.

Last edited by FrankW; 03/24/2011 6:31 AM.
FrankW Ex Speedmaster rider, went to the Dark Side now riding an America.