Originally Posted by demarsjcd
I still havent checked it with a voltmeter but I will try that on saturday.
12 minute is not long enough to fully recharge a flat battery .. try an hour at least.
There will be a manual for your bike .. may be not this years model .. one that covers a few years ago model.. It should giove you enough information. Join a HU community near you and ask for help .. much easier to physically show you want to do then type it all in ..
The DMM should also have a manual .. read it and use the voltage function to measure the battery voltage ..
Battery at rest (bike stoped - no charging) 12.5 volts - if less = crock battery or discharged battery.
Battery on bike - above idel speed between 13 and 14 volts
if less - not charging? Try externally charging the battery up
if more - regulator/rectifier is toast.
Leave the bike discharging the battery for another time. It sounds like it is not charging the battery on the bike ...
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S