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Case Tractors Discussion Forum

Positive or Negative ?

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Barry

10-29-2003 18:04:27

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I have a 51 VAC with 6 volt battery and negative ground. When I bought the VAC someone had put an alternator on it with a voltage reducer to 6 volt.

Now I just bought a 52 VAC and it has a 12 volt battery with a positive ground and looks to be original generator.

Should the 51 be negative ground ?
Should the 52 be positive groung ?
I am confused maybe some converted the 52 to 12v ?
How would I know if it has been converted? I cannot find any markings on the generator or the coil as to how many volts they are.

Any help on this would be greatly appreciated.

Thanks, Barry

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Lew

10-29-2003 20:20:21

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Re: Positive or Negative ? in reply to Barry, 10-29-2003 18:04:27

My 51 VAC was delivered with 6 volts and positive ground. I converted to 12 volts by replacing the light bulbs, inserting a dropping resistor in the coil circuit and adding a separate switch for the lights. I kept the original generator and replaced the cutout relay with a 12 volt version. The generator will charge about 10-15% over the exication voltage supplied. Since the rate of charge is controlled by the old 3 position "light" switch I never have to put it in any position but the lowest one. That is why I use a separate light switch because if I use the lights "on" position on the 3 way switch, the generator charges too much. I have considered using some modern 12 volt negative ground items but as yet have not bothered. To do so I would need to repolarize the generator. My 12 volt "cutout relay" is really a 40 amp solid state diode in the charge line. Its only purpose is to prevent the battery from discharging through the generator when the tractor is not running. I have since replaced the old 6 volt coil with a 12 volt one so have discarded the resistor. If I every switch to an electronic ignition I will convert to negative ground as there is a greater selection of units available. Hope all this rambling helps. Lew Van Vliet Wisconsin

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