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Allis Chalmers Discussion Forum

A/C B Generator Polarity

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Bud Wackerle

08-19-2003 07:51:42

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My newly restored B does not recharge the battery. It is a 6 volt positive ground system as the diagrams show. When the light switch is pulled out to "High Charge" the amp meter shows almost 30 amps in the dischage direction. I have unhooked the battery while the tractor is running and it stalled, thus I know?? the generator is not providing voltage. I have switched the leads on the amp meter to no avail. I believe the rebuilt generator is polarized negative and needs to be repolarized. What is the procedure to polarize (Repolarize) a generator.

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08-19-2003 20:21:15

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 Re: A/C B Generator Polarity in reply to Bud Wackerle, 08-19-2003 07:51:42  
the light switch acts as the ground for the "F" terminal on the generator. Partial ground (thru resistor) give partial current (charge about 3 amps). Full ground gives full charge, about 8 amps.----to test the generator, remove the two wires off the A anf F terminals. ground the F terminal to frame. start tractor and measure the voltage across the A and F. should be about 10-12 volts non regulated. Connect the A to the battery negative side and it will go to about 7 volts. connect the A to the cutout and then to ampmeter, then to battery and it should still charge. --about 7 volts.--- last of all, connect the light switch to the F terminal and groudn the light switch. If it still charges, the light switch is properly grounded. ----- -- You can eliminate the light switch for a short time and just run the "F" to ground. THe big 8 amp output is not enough to overcharge battery for short periods (an hour or so).

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Steve in N.J.

08-19-2003 08:55:45

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 Re: A/C B Generator Polarity in reply to Bud Wackerle, 08-19-2003 07:51:42  
Make sure the light switch is properly grounded. Quite a few times we've found that paint has insulated the headlight/charging switch from grounding to the inside of the Ammeter box on freshly restored tractors resulting in a "no charge" problem. These switches are self grounding, and is needed to full field the generator to charge thru the ground. Make sure the inside of the Ammeter box is free of paint where the switch attaches. An auxilary ground wire off the mounting screw also helps to make sure the switch is grounded. HTH
Steve/B&B Custom Circuits

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