Mark,
Check to see if there is +12 volts at the "A+" terminal of the voltage regulator. Try to measure at the tab on the regulator. This wire goes from the "A+" terminal to the battery post on the starter solenoid.
Verify that the wires and connections from the voltage regulator's "F" (field) terminal and the "S" (stator) terminal are clean and not broken. Check both ends of each wire. The copper wire has been known to have broken INSIDE of the insulation, which makes the break very difficult to find.
Try adding an extra ground to the voltage regulator's metal base.
If you are still using an ammeter, make sure that everything is ok there.
John
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