9N voltage regulator...

The 9N came from the factory 6-volts positive ground with a 1-wire 3rd brush genny and a 2-terminal roundcan cutt-outt relay under the battery tray.

You do realize that the genny and the cutt-outt relay have to be "polarized" to the battery polarity, don't you? You can "polarize" as many times as it takes to make you feel warm and fuzzy. So go ahead and do it again.

To polarize a 9N electrical system, I take a pair of pliers handles and "arc-spark" the 2-terminals of the roundcan cutt-outt relay. Simple, eh?

There should be NO continunity across the cutt-outt 2-terminals when the engine is OFF. There will be continunity when the engine is running but DON'T TEST IT 'cuz you'll burn yer ohmmeter guttz. More better, you use the voltmeter function. 6-volts between the 2-terminals, engine off, ZERO volts between the 2-terminals, engine running.

The 11 amp 1-terminal 3rd brush genny is manually adjusted for charging rate 3-5amps as read by yer ampmeter. That means you haffta gitt outta yer seat and "tweak" the 3rd brush control on the backplate of yer genny while engine is running at about 1/3 throttle. Simple, eh?..... ...respectfully, Dell

1) Based on your post above, its my guess that one terminal 9 N Generator uses an internally case grounded Field winding (one of its ends) while its (other end) ungrounded Field terminal is powered up off the third brush. Of course, the closer its adjusted to the armature brush the more field curent and the more the Gen puts out.

IS THAT CORRECT ????? ????? ?

IS THE 2N THE SAME ????? ????

2) Do some or all or any of the 8N Fords that use a full fledged 3 terminal Voltage Regulator operate as Class A (VR provides a ground for the Field) or Class B (VR supplies Voltage to the Field which is internally grounded). I was thinking the Fords used Class B but not sure which models????? ?

ANY HELP????? ????

Thanks a lot

John T Nordhoff in Indiana

The 1948 8N uses a 3-terminal shunt-wound genny with a 4-wire (BATT, ARM, FLD, GND) "viberating field relay" squarecan voltage regulator in a "class A" genny charge configuration. While one of the genny to VR wires is a "ground" wire, it is NOT a control wire but provides low resistance ground between the genny barrel and the VR frame for voltage reference. The speed of the vibrating field relay is dependent upon the battery volts and controls the current thru the genny field and consequently the magnetic field strengh which controls the genny AMPS output. It also has a polarity sensitive cutt-outt relay and 2-relay cores.

The 1953 NAA Jubilee and onward was changed to the "class B" genny charge configuration..... ...Hope this helps..... ....Dell, 40yrs Electronics Engr, ret Boeing Flt Test Engr

John T, retired electrical engineer but NOT a Ford man.