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Most of the Amps drawn on these bikes is the headlight. I am not entirely sure what style of bulb the Brozz uses, but on the Hawks they come standard with a fairly low output H4 with a 35W low beam if I remember correctly. That means that at 12 volts the headlight alone draws 2.9 amps.
Combine that with a 21W/5W bulb (tail light for most) or an standard 1157 for the rear lights (about .5amps.
that's 3.4 Amps of current draw on a stator that, at best, at 1500rpm idle speed, puts out 3.5 Amps, and disclude any other system draws, and you basically end up with a bike that neither charges or discharges when sitting still. While riding though, it should be able to keep up.
The fact that your bike isn't keeping up even at idle makes me wonder if you have a 55w halogen headlight bulb, which is pulling closer to 5 amps. Combine that with any other draws on the system, let's just call it a total of 6 amps, and it would be no wonder that your bike would not charge at all.
If you really want to test this theory, see what your charge voltage does at say 7000rpm. If the previous is true then it should actually show some level of charging at that point. If not, then you may have a poor connection somewhere in the harness or at a ground point, a battery with too much internal resistance that won't take a charge, or a few other very very remote possibilities.
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