1997 Buell M2 with Buell XBR headlights fitted. with a fresh charge in the battery bike starts and runs fine, if i ride 10-15 miles with the lights on and stop battery is flat, if i run with the lights off battery is fully charged. This did not happen when these light were first fitted, have checked wiring no obvious faults.
Sounds like the headlights are either pulling more current than the stator can provide(doubtful) or you have something bad(regulator or stator) that needs attention. Either way - the bike is built to have the headlight ON all the time it is running. Check to make sure that your battery terminals/cables are GOOD AND TIGHT and get out a volt meter. Put the meter on the battery with the bike off. Start it. Check to make sure the voltage goes up - if it does not - the bike is not charging.
SOURCE: Battery drained while riding
chek your connection where the alternator plugs into your engine casing & spray it with electrical contact cleaner
SOURCE: 2005 Triumph Daytona 955i Dead Battery and Check engine Light
I have just found my 30 amp fuse blown on my daytona , this prevents the alternator working , it was reading 10.9v before I changed the 30 amp fuse , now it reads 14.5 volts , I think I blew it as I didnt know how to put the alarn into service mode and left the ignition on , anyway I am hoping its just that , 3 heat up/cool down cycles and the engine management light should go out
mike
SOURCE: new battery, fully charged, motorcycle runs until
Check the charging rate of your bike ,it seems there is a problem to it.
SOURCE: Bike does not start after an hour of riding.
test stator loaded and unloaded,then do voltage drop test
SOURCE: CHARGE BATTERY, THEN START BIKE UP. AFTER RIDING
Sounds like you are not getting a charge from the alternator. You need to check battery voltage with a meter with the engine off, key off. Then again with it running, and the voltage should increase. If not, it's not charging.
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Have checked charging system, output from alternator is fine, output from regulator seams low but i did swat out for another one and the output was the same
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