Paul, Electronics is not my strength (I am not sure what my strength is), but I just went through the process of testing the generator, polarizing, new ammeter and new voltage regulator.
I knew my generator was working fine, but when I fired it up, the ammeter barely moved. All that work and no worky. Not happy.
The problem was that there was no problem. I believe that if the battery is fully charged, the regulator throws away the juice coming from the generator because it doesn't need it and does not want to overcharge the battery. So the ammeter sees no difference.
So what I did was turn on my headlights to drain (engine off) the battery. Started her back up and VOILA. The ammeter came to life.
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