With the engine off disconnect the neg lead from the battery. Switch your multimeter to current (highest setting first if it's not autoranging) and connect between neg lead and neg terminal. You can then see how much current is being drawn with the bike turned off. You then start pulling fuses until the number drops and that's your culprit. The only thing you need to find out is what is an acceptable (normal) level of current with it off. Another good test that's been useful on cars for me, not bikes yet is to measure the voltage drop on the earth to chassis connection. If you go to turn the bike over but it's really sluggish, lights dip etc, but the battery checks out fine every other way it's possible that you've got a bad earth lead or bad earth connection. To find out, switch the multimeter to volts, set it to 12v range and place the probes as either end of the earth lead. Then try and start the bike. If your lead is good then the voltage drop should be close to zero but I've had them read 1-2v which is definitely going to affect starting. You then replace the earth lead or remake the chassis connection if you've taken that in to account. Fair enough, its sounds easy enough to do, but forgive my ignorance but which one is the current one? Is it the ohm sign one? I'm not too good with electrics lol NO. Ohms is for resistance. If the meter is capable of reading current you need to select either “A” or amp or amps or mA. Also make sure it is on DC not AC. Se picture below of meter selected to read Amps. Also note there may be different sockets for the probes again see picture below.