| hi , no need to repolarize ; on a Voltage Regulator, once they are polarized to each other , they remain fine , battery there or not . FYI —- what it does when you jump the battery to armature non running is to magnetize the generator field magnets in the correct way so as to generate + 12 v at the output . A generator ( unlike an alternator) would be just as happy making -12 as +12 . But the car won’t like that !! At the first moment of slowly turning, called “ build up “ , — which polarity it will make is determined by the weak magnetism left in the field iron from the last time ( called remanence, or residual magnetism) This is like when your screwdriver gets magnetized , things stick to it; if you checked it with a compass one end is North one South . It will stay north or south . Same with the generator field magnets , — and they stay that way , (weakly ) essentially for good . So you will get + out , if it starts out weakly + Inside the regulator , one of the three relays is the cutout , it too works on the difference ( by having two coils) between direction or + polarity the voltage is , and the direction the current flows . When any current flows backward into generator , ( = it is going too slow ) the current coil will weaken instead of strengthen the voltage coil pull on the cutout relay and the contacts will pop open, disconnecting “A “. Never push down on any of those relays , when stopped , as there is no voltage on A then , and the backward current in one half the coil WILL immediately lock the cutout contacts closed , running the battery into the stopped generator at a high rate possibly hurting the generator ( it tries to run as a motor but the belts stop it ) . Disconnect the battery to reset that . Do quickly nothing is hurt . So , not a big mystery anymore !! John
-- Sent from my iPhone not by choice thank goodness, I have one I found while restoring my G “in progress” now I know where it goes. Richard
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