[AJD] Late John Deere Model B Generator

[Paul Ward]

Duane,

This is great information!  You bring up an interesting point that the
generator may have been changed.  I will go out to the tractor later this
weekend and see if I can get the information from the generator.   Perhaps
the battery _is_ fully charged.

Paul Ward
psward at neo.rr.com

-----Original Message-----
From: antique-johndeere-bounces at lists.antique-tractor.com
[mailto:antique-johndeere-bounces at lists.antique-tractor.com]On Behalf Of
Duane Larson
Sent: Friday, September 03, 2004 11:37 PM
To: Antique John Deere mailing list
Subject: Re: [AJD] Late John Deere Model B Generator

Paul,
You have asked several questions which could take several pages to answer
properly, but I'll take a shot at short answers and perhaps others will add
to this.

"what is the difference between a cutout and a regulator - are they the
same".  No, they are not the same.  A cutout is normally used with a "third
brush generator" to provide charging voltage to the battery when it requires
it.  It provides no charging voltage if 1) the battery is fully charged, 2)
the generator rpm is too slow to provide adequate voltage, and 3) the
tractor is not running so the battery does not discharge back through the
generator.  A regulator provides the function of a cutout, and in addition
regulates the amount of charging current (and sometimes voltage) to the
battery.  In a system using the cutout, the charging current is regulated by
moving the third brush position, or by a resistor placed in the charging
circuit at one position of the light switch.  More modern "two brush"
generators utilize a regulator to perform the regulation automatically.

"the regulator is square, mine is not" - regulators contain more parts than
just the cutout relay, so it is larger.  That is one way to identify if a
regulator or cutout is used for controling the charging voltage/current.

"...page 80-5-6 - what is it"  - that page is from SM-2029, the JD
Electrical Systems Service Manual, still available from JD.  If you want to
learn about generators, cutouts, regulators, and how to connect them up, you
should consider ordering (or borrowing) a copy of this manual.  It covers
many other things, starters, magnetos, distributors, ... , and gives the
part numbers for what goes on what tractors.  It is available through your
dealer, or jdparts.com.

"should I have a regulator" - depends on what generator you have, and what
wiring.  You can put a regulator on a generator, but some additional wiring
will be required if it is set up for a cutout.

The wiring diagram you have is correct, but is for a regulator and not a
cutout.  From SM2029, you should have a DR 1101390 6V generator, and a DR
1118305 regulator on your B.  Apparently the regulator has been changed to a
cutout, or more likely the generator has been replaced with one using a
cutout.  If you can provide the generator number from the tag (and the
serial number) I may be able to provide more info.
Hope this helps.
Duane Larson

----- Original Message -----
From: "Paul Ward" <psward at neo.rr.com>
To: "JD List" <antique-johndeere at lists.antique-tractor.com>
Sent: Friday, September 03, 2004 10:13 PM
Subject: [AJD] Late John Deere Model B Generator


> I am thoroughly confused and need help from the Late Model B generator
> experts here on the list.
>
> I have a '52 Model B  SN B310047 with a generator that has a "cut-out".  A
> fuzzy picture of it can be seen at
> http://home.neo.rr.com/bunker/P7310001.JPG
>
> What is the difference between a  "cut-out" and a regulator, if any?  In
> Spencer's first book on restoration he refers to them as one and the same?
>
> In the B service manual, the regulator appears to be square in shape - not
> rectangular like mine.  Why?
>
> I have a copy of the electrical hook up from what I can only guess is
> another manual I don't have  (It's not the service manual and I'm not sure
> which manual it is.)  It's page 80-5-6.  On this page it shows three
> terminals L, White, and F.  It looks like it has a wire to ground on the
> generator too.  My "cut-out", regulator, or whatever it is only has two
> terminals and from the wiring loom, there are only two wires.  Why the
> difference?  In my photo, it appears that one terminal goes to ground,
while
> the "white" wire is connected to the terminal in the rear.  The other wire
> from the loom goes to what I believe is the F terminal on the generator.
>
> Should I have a three terminal regulator on this generator?
>
> Perhaps I need a Model 50 wiring diagram for this B?
>
> The ammeter is not showing negative or positive.  The generator was
recently
> serviced and the cutout/regulator was replaced with an new identical
> cut-out/regulator.
>
> I'm soooo confused!
>
> Any ideas?  Am I a victim of a mid model parts change?
>
> I appreciate your help!
>
> Paul Ward
> psward at neo.rr.com
>
>
> _______________________________________________
> Antique-johndeere mailing list
> http://www.antique-tractor.com/mailman/listinfo/antique-johndeere

_______________________________________________
Antique-johndeere mailing list
http://www.antique-tractor.com/mailman/listinfo/antique-johndeere