How to Polarize a 6 Volt Generator on a 600 Ford Tractor


Ford's 600 series tractors followed a long line of popular models that helped establish the company's overall success. The fact that these antique tractors still function is a testament to their steadfast reliability. One of two types of generators may be employed in the charging system of the tractor. Original equipment "B" circuit generators are identified by the field wire being grounded to the frame or grounded brush of the generator. A replacement "A" circuit generator, like a Delco, has the field wire attached to an insulated brush. Polarization is necessary for proper function and is easily accomplished in short order.

Things You'll Need

  • Screwdrivers Wrenches Jumper wire

B Circuit Generators

  • Locate the field, or "F," terminal of the voltage regulator. Remove the wire from this terminal, using a wrench or screwdriver, depending on the terminal configuration. Touch the field wire to the battery, or "B," terminal of the regulator very briefly. Use a jumper wire if the field wire will not reach the terminal. Sparks upon contact signify successful polarization.

  • Connect the field wire to the proper terminal of the voltage regulator. Start the engine.

  • Monitor the tractor ammeter for needle movement on the positive side of the gauge. Repeat this process if no positive charging is exhibited immediately after starting the engine. Interpret low positive readings as an indication of a well-charged battery.

A Circuit Generators

  • Locate the battery, or "BAT," terminal of the voltage regulator. Attach one end of the jumper wire to the battery terminal of the regulator. Quickly touch the other end of the jumper wire to the voltage regulator terminal marked "GEN" or "ARM." You may notice some light arcing when the contact is made and released, which is a normal display of corrected polarity.

  • Remove the jumper wire and start the engine.

  • Watch the ammeter needle for movement toward the positive end of the gauge. Ensure that the gauge needle returns to near zero amps after running the engine for a few moments. Check the generator belt for tightness or the battery state of charge if the ammeter needle remains deep in the positive values of the gauge.

Tips & Warnings

  • Remove the generator inspection clamp ring to trace the field wire when determining the circuit of your generator.
  • Performing the "A" circuit polarization to a "B" circuit generator can damage the voltage regulator windings and the generator armature.

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  • Photo Credit Creatas Images/Creatas/Getty Images
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