Electrical garbage.

[SPARKSS]

How does voltage from the dc side ruin the R/R?

I thought the R/R only dealt with the ac current?

Finally.....someone has their thinking cap on 'n locked

[focus frenzy]

Your charger may have been on a 12-volt setting, but I think if you measure the voltage in that setting, you may find that it is in the 15-17 volt range. They do that to keep the amps down that the unit has to produce. Most cars and trucks can absorb this relatively well, but a bike doesn't stand a chance. You may have fried your regulator, but you will have to get the engine running and put a volt meter on the battery terminals to tell for sure.

older cars and trucks yes, but newer cars electronics do not like anything over 15 volts.

the average GS charging system only makes about 24-25 amps total, it takes 4-5 amps to run and you will typicly see a charge rate to the battery of about 12 amps and that will taper off as the battery voltage rises, whats left is shunted away as heat.