Try a diode in the #1 circuit, AT THE ALTERNATOR. White banded CATHODE end goes to the #1 terminal.
I use 1N5408's, 3 Amps and 1000 PIV. If you can't find a cheap local source, I'll put one in an envelope and mail it you NC.
This will prevent any chance of the current the diode trio supplies to the regulator and rotating field from leaving the alternator thru the #1 terminal due to defective/improper wiring and killing the diode trio or regulator.
"when I metered the #1 terminal (it was last year so going on memory) it showed around 8 or 9 volt."
If that reading is correct with the engine running fast enough for the alternator to charge it would indicate an alternator that's already "sick" or something in the wiring loading the #1 terminal. You should "see" a voltage there VERY close to the voltage at the alternator's output stud.
The diagrams below show the effects of loading the #1 terminal.
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