1) First, remove the battery, fully charge it (trickle charger, overnight - also fill up any cells that are low with distilled water beforehand [assuming its not a sealed battery]), and then take the battery in to be tested to see if its good or bad.
A bad/marginal battery cell can 'appear' to be a charing system issue.
If the battery tests OK, then you need the shop manual for the bike. You'll test the output of the stator/rotor assembly, This critter puts out alternating current (AC). You'll measure the voltage between all of the sets of wires - usually three (the manual will have the value to test for). If that tests fine, you can either just try a new regulator or simply take the old one in to a shop to be tested.
"Normal" charing system output is 1-2VDC above the "resting", fully charged battery voltage for your bike.
YMMV... :shurg:
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