Here's some very useful info posted by "dangerdan" on how to detect what is drawing off the battery in your bike.
Get yourself an amp meter with a range from 10 mili amps to 10 amps DC.
Place it in series between the battery and the red cable, making sure your on the highest scale and observe polarity.
Reduce the range on the meter till you get mid to full scale deflection. If you are using a digital display note the value. Now start disconnection wires or removing fuses . When you get a ZERO value you have found which leg or device is causing your problem.
Note:
Harley alarms will cause a small draw on the battery.
Get yourself an amp meter with a range from 10 mili amps to 10 amps DC.
Place it in series between the battery and the red cable, making sure your on the highest scale and observe polarity.
Reduce the range on the meter till you get mid to full scale deflection. If you are using a digital display note the value. Now start disconnection wires or removing fuses . When you get a ZERO value you have found which leg or device is causing your problem.
Note:
Harley alarms will cause a small draw on the battery.