I have an '06 SM 610 with no aftermarket electronics or lights. It stalled at a light a couple weeks ago and wouldn't start up, the voltage light on the cluster was flashing so I thought I just had a dead battery. Wheeled it to a friends shop close by, checked all fuses, checked the battery which was 12.6 V, jumped it to check the charging voltage which was fluctuating constantly from about 4-11 V. Strange! But this immediately made me think it was the voltage regulator. Rode it home, all the lights on the cluster and headlights were flashing the whole way home. Reading through the manual to test the voltage regulator it basically said what my bike was doing meant a bad regulator, so I ordered one...Yup you guessed it, same damn problem after I put the new one on. What else could it be?
Thanks for your input!
Joe

Joe