Ralph,
There has been lots of information on this post so I don't know if I'm flogging a dead horse. It makes sense to me to check each component individually to clear your list of probably suspects.
Have you ever disconnected the generator, attached a voltmeter to ARM and run the engine up in RPM as you touch FIELD to ground. This takes all the wiring and regulators out of the equation and tests only the generator. If this proves good, scratch it off the list and examine the wiring from generator to regulator.
When that proves to be good, move on to the next step. The test with the battery charger attached to the ammeter feed wire moved the meter which proved it works, so the next logical step would be to start at the generator and work toward that feed wire to the ammeter.
The generator is sort of a stand-alone unit. It can be tested all by itself for functionality...it works or it doesn't. Does this make any sense!
Stuart
