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Ford 9N, 2N & 8N Discussion Forum
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Charging system question???

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redlin49

05-27-2007 23:26:03




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When everyone talks about "dead grounding" the genny's field terminal to help figure out charging problems; is this done by adding a jumper wire to the genny's field terminal and attaching it to the frame and leaving everything else in place such as the wire already attached to the genny's field terminal which runs up to the light switch (cutout relay system)?




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L Ford

05-28-2007 11:09:12




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 Re: Charging system question??? in reply to redlin49, 05-27-2007 23:26:03  
Red, temporarily placing a jumper between field and ground terminals on the generator while the tractor is running, or "dead grounding' doesn't require that you disconnect the various other wires from the generator... you are bypassing the regulator to make the generator operate at full capacity. as Dell so politely and respectfully (heh) explained, you shouldn't 'dead ground' it too long, as generator damage will result.. just long enough to check the output on your ameter. I wouldn't worry about explaining your reason for wanting to know all this,(that's really your business) unless you're interested in some more 'respect' from Dell. ;-)
good luck with your charging problem.

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Dell (WA)

05-28-2007 00:15:32




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 Re: Charging system question??? in reply to redlin49, 05-27-2007 23:26:03  
redline..... ...you write..... ."When everyone talks about "dead grounding" the genny's field terminal to help figure out charging problems; is this done by adding a jumper wire to the genny's field terminal and attaching it to the frame"..... .close but NOT quite right.

The 3-wire 8N 6-volt genny has 2-terminals on the side of the genny barrel; one is INSULATED FIELD stud and the other is.....would you believe GROUND??? ..... .."dead grounding" or more correctly, FULL FIELDING involves connecting these two genny barrel posts together with a jumper wire. Isn't that amazing??? Watta concept.

Full-fielding MAXIMIZES the genny OUTPUT to about 20-amps. ( and about 7.5-volts) That is what you should read on yer dashboard ammeter. Simple, eh?

DO NOT FULL FIELD for very long as you will OVERHEAT yer genny and melt the solder in the commutator and throw it out. Incase you haven't priced GENNYS are NOT CHEAP.

You write..... .."the wire already attached to the genny's field terminal which runs up to the light switch (cutout relay system)?"..... .OK, I can tell we're having MAJOR electrical system description problems here.

NO WIRE normally runs from the genny to the lite switch. And iff'n ya did, it would come from the genny BIG STUD ARMATURE OUTPUT and NOT the field terminal.

What else ain't ya telling us??? 6-or-12 volts??? genny or alternator??? 8N with 3-wire genny and squarecan voltage regulator under the oilpressure gauge??? ....OR.... 2N/9N 1-wire genny with roundcan cut-out under the battery tray???

And WHY are you asking the question about FULL-FIELDING??? Are you having electrical problems???? Tell us MORE so we can better help you..... .respectfully, Dell

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dan hill

05-28-2007 16:32:03




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 Re: Charging system question??? in reply to Dell (WA), 05-28-2007 00:15:32  
John Deeres and Farmalls have the light switch connected to the generator.On the full in position of the switch the generators runs on low output.A 3 ohm resistor is in the field circuit in the position.When the switch is pulled out one notch the resistor is jumped and the generator charges at the rate the 3rd brush is set at at.2nd notch out turns the lites on..Farmalls use a rotary switch.The box is marked low high and lites on.

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