After 2 years....

of absolutely flawless reliability (and 1 month after my warranty ran out ) I have a situation that makes the bike useless. What I have: a 2002 M620.

The problem: The battery is being drained while I am riding. Once I arrive at my destination after about 60 miles and turn the engine off, I get that 'wonderful' 'click' 'click' sound when trying to start again.

What I do know: The alternator is functioning/charging during the full rpm range. The battery is fine; after the problem first appeared I bought a new battery. I can tell to some extent when there is almost no current in the battery left to start the bike: the idle speed is slightly under a 1000, as apposed to when the battery is fully charged it is slightly above a 1000. Also, this maybe more my imagination, but it seems to drain faster when the temperature is warmer; afternoon ride vs. early morning ride.

The question: How does one trace/investigate the source of this particular problem?
Where's the first place I should be looking at.

For starters what is your battery voltage looking like with the bike off and when the bike is running.

Also you might want to use the search feature of this board at the top right. Do a search for battery. You get lots of info.

jager,

When the bike is running, V is between 13.5 and 14.5 during the entire RPM range, and
between 12.5 and 13 when not.
Will do the 'battery' search.

thanks.