In Reply to: Re: 6 volt generator posted by JMOR on November 12, 2012 at 12:13:40:
Sorry, no cigar
The purpose of the polarization procedure is to polarize the coil in the voltage regulator. This action sets up the direction of current in the voltage regulator coil so the charging system operates properly.
For all FORD type voltage regulators the regulator is polarized by jumpering between the hot side of the battery(negative terminal with positive ground)) and the field connection on the voltage regulator independent of the external or internal energy source for the field coil winding and independent of external or internal grounded field winding.
Now, for all GM type voltage regulators which are wired differently than FORD, the polarization is accomplished by a jumper between the hot battery terminal and the "armature" for all generators, independent of voltage source and ground condition of field coil.
JMOR diagram
The diagram is not consistent with the FO-4 manual.
The manual does not refer to an "A" or "B" generator..
what is the source of the A & B generator?
However, page 49 (FO-4) references in Fig FO73 ,generator 8N-1000-B or C
Fig 177 shows a generator with three terminals including one for an "external" grd
generator with PN 8N10000BLPR for serial # < 263844 with cutoff date
some where in 1950.
Fig 178 shows a generator with what looks like two generator terminals and a third
wire going to the chassis. This generator appears to have an "internal"
ground with PN 8N1001LPR for serial # > 263843
Do not have manual, FO-19 for the NAA
Unable to find any defining reference for "A" or "B" in the documentation.
Generator test
Connected my three terminal generator with "external" ground as shown in fig FO77 and the generator ran like a motor with the jumper between field and ground. You indicated in this thread that I was describing the connection of an "A" type generator.
Now on page 52 in manual FO-4 in the left column below fig FO77 there is text describing how to polarize the circuit as described in fig FO77 ,which has been established as a Type A generator by your statement. From your lable, type A generator must have an internal sourced field with external or internal grd field and type B has an external sourced field with an internal only grd field, only one choice.
The text on page 52 of FO-4 says to jumper the "field" to the hot side of the battery,( negative terminal for positive ground) to polarize the charging circuit.
Your diagram showing the voltage regulator and generator is inconsistent with the manual. You show the A type generator being jumpered from the battery hot side to the "armature" rather than the "field" as indicated by the manual. This is incorrect for the FORD type voltage regulator.
How about case #3. Internally grounded field, 3 brush, internal sourced field.
This generator is found on early SN's with the "cutout" type relay with two terminals rather than the voltage regulator with three terminals. There is no field terminal at the generator ,only the armature terminal for this case. This case would be defined by your labeling as a type A with internal sourced field. Since this generator only has one terminal, which is the armature, jumpering between the battery hot side and the armature is the only choice which is consistent with your diagram. The diagram only covers the cases with voltage regulator, which makes a lot sense. What happened to the case with the generator connected to the two terminal cutoff switch.
Answer: With a two terminal cut out switch, NO polarization is required.
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