So I jumped the voltage regulator and unfortunately the charging light did not go out. What would the next step be? Diode board? My understanding is that an open rotor results in no light. Is that true? The brushes looked OK to me, but I didn't do any scientific tests on them
I think the purpose of jumping the regulator was to find out if there was a voltage increase when doing so. If the regulator is at fault, I believe the voltage will increase dramatically when the engine is revved. If it didn't increase, then you definitely have an alternator problem. Time to methodically go through the above links.