Thanks Steve .... I copied your reply below in parts and have put in some QUESTIONS IN CAPITALS.
With the engine running and up to speed (not idling), the regulator wire disconnected, check the F terminal with a test light or voltmeter to ground. If you get a voltage reading, it is a type A. Ground the F terminal, it should full charge.
QUESTIONS: 1)SO EVERYTHING IS WIRED UP AS USUAL FOR THIS TEST EXCEPT FOR ONE REGULATOR WIRE? WHICH REGULATOR WIRE IS DISCONNECTED? OR ARE MORE THAN ONE REGULATOR WIRES DISCONNECTED? 2)SO 'FULL CHARGE' WOULD BE SEEN AT THE AMMETER WHEN THE F TERMINAL IS GROUNDED?
If there is no voltage, it is a type B. Jump from the non grounded side of the battery, it should full charge.
QUESTIONS: 3)JUMP FROM THE NON-GROUNDED SIDE OF THE BATTERY TO WHERE? TO THE FIELD TERMINAL ON THE GENERATOR? AND FULL CHARGE IS SEEN AT THE AMMETER?
It won't hurt to experiment, get it wrong it just does nothing. Just don't experiment with the regulator connected.
QUESTIONS 4) SOUNDS LIKE ALL WIRES TO THE REGULATOR SHOULD BE DISCONNECTED FOR THIS TEST, LIKE TOTALLY REMOVED?
As for determining the regulator, you can take the cover off and trace the circuitry, see where the path of the F circuit goes. If it goes to ground, its an A, if it goes to the battery, it's a B.
QUESTIONS 5) SO DISCONNECT THE REGULATOR COMPLETELY FROM THE TRACTOR TO DO THIS TEST? SO THESE ARE CONTINUITY TESTS BETWEEN THE REGULATOR'S F TERMINAL AND GROUND (THE REGULATOR BASE)FOR TYPE A .... OR BETWEEN THE REGULATOR'S F TERMINAL AND THE REGULATOR'S BATTERY TERMINAL IF TYPE B?
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