Some Lucas generators are A circuit, and some are B circuit. The regulator must match that factor. the 2 brush-3 brush makes little difference. An A circuit uses a field that is supplied with voltage from the armature terminal, (or third brush), and is regulated by grounding the field terminal through the regulator (which must have a good ground from its body to the tractor). A B circuit has a field that is grounded inside the generator, and is given voltage from the regulator. Very different designs. If the regulator was sent as a match to the generator, it may be OK but needing a good ground. If mismatched, it will never work. With all wires off the generator, and either one of the brushes lifted off the commutator with an insulator (like a plastic knife blade) the A type will have continuity between the two terminals, and nothing to ground. A B generator will not, but the F terminal will show a connection to ground. (just a few ohms). Jim
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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