John Deere B Voltage Regulator

Jim R · Dec 28, 2016

I have a 1952 John Deere B. I recently had a friend check out the Generator and charging system, and he installed a new voltage regulator. I also checked to make sure the regulator was correctly polarized. The tractor is still 6 volt, positive ground. After running the tractor for a little while, the ammeter seems to go back and forth between charge and discharge. If it shows a discharge and you turn on the headlights, it will go back to charging just a little. Then turn off the headlights and the ammeter might stay charging for a while or it might not. I had the same problem with my 1948 8n Ford with a 6 volt, positive ground. On that tractor I finally went out and bought a US Made Voltage regulator and put it on and I have Not had any more problem since then. I think I need to do the same thing with the John Deere B. The John Deere B generator was checked out and gone through by a local generator shop so I know there is nothing wrong with that. Do any of you John Deere guys out there have any ideas?? Has anyone else out there had a problem with the cheap made foreign voltage regulators? Thanks for any advice!!

John T · Dec 28, 2016

First of all, you Polarize the GENERATOR NOT THE VOLTAGE REGULATOR

Next, at the shop the genny may??? have been polarized for NEG ground while your tractor is POS ground

Next if the tractor was ran very long at POS ground when the Genny was polarized NEG ground, you may have harmed the
Voltage Regulator.

YES I have had problems with cheap Voltage Regulators, some may NOT be suitable for POS ground.

For a complete charging troubleshooting procedure see my link below

John T
John Ts Troubleshooting

Jim R · Dec 28, 2016

The Generator was polarized for Positive ground.

machineryman · Dec 28, 2016

I thought they had an instruction slip in the box and don't you do the polarization without the tractor running?

ET · Dec 29, 2016

A properly working regulator slows the charging rate down as the battery reaches full charge.

Jim R · Dec 31, 2016

I went ahead and bought a U S made voltage regulator from the Brillman Company and installed it and polarized it per the directions and it works great and charges much better than the old regulator. No more foreign built electrical parts for me!

John Deere B Voltage Regulator

Jim R

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John T

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Jim R

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machineryman

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ET

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Jim R

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