It isn't an accurate measure, but you can always hook everything up and get a voltmeter on the battery. The battery should sit at 12.5 volts with the engine of, settle at 13.5 or so just above idle and stay in the range 12.5 to 14.0 regardless of what you turn on after a few minutes to sort itself out. If it drops to 12 it's probably discharging but you don't know how quickly, if it shoots up to 15 and stays there, the VR is trying to take the strain but is probably loosing.
For an alternator upgrade on anything thats not a flat twin you need to find a rotor that'll fit from a bigger set up. Given most bike manufacturers don't even think you might do this, it's almost impossible unless you stumble across the right part.
Andy
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