Polarizing a Generator
After a generator has been worked on and is reconnected, it should be polarized by connecting the fields momentarily to the battery before the engine is started. Polarizing the generator, on most Delco and Autolite generators, you momentarily touch a jumper wire to the "B" or "BAT" terminal of the regulator or cutout relay, and the "A"or "ARM" or "GEN" terminal of the regulator or cutout relay.  This assures that the generator will have the correct polarity with respect to the battery it is to charge, regardless of whether the battery is + or - ground.