[AJD] 8 Volt Batteries

[Bill Brueck]

You should be able to safely hook it up if you put a volt meter across the
battery while you charge it.  Keep an eye on it, when it gets over about 11
volts I'd turn the charger off else you'll cook the battery.

This will put a bit of a strain on the charger but if you have a choice of
charging rates, which you seem to have, I'd think keeping it at a low rate
would protect the rectifiers from getting overloaded.

If you want a more permanent charging arrangement, I'd experiment with a
resistance in series with the battery and charger.  You can measure the
voltage across the resistance and see if you're close.  Lessee, a 12 volt
charger should put out about 15 volts, you want about 11 for the battery, so
the drop across the resistance should be about 4 volts.  I'd start with a
generator field coil and see if that's close; just a hunch, I have no idea
what resistance would be appropriate.

I guess the real solution is to fix the charging system on the tractor.

B²
Bill Brueck (brick)
Chatfield, Minnesota USA

Confusion is a higher state of knowledge than ignorance.
----- Original Message ----- 
From: "Phil Kelley" <philkelley at alltel.net>
To: "Antique John Deere mailing list"
<antique-johndeere at lists.antique-tractor.com>
Sent: Sunday, September 19, 2004 10:37 AM
Subject: Re: [AJD] 8 Volt Batteries


> I have just purchased a F-300 that has an 8 volt battery.  The battery is
> not charging in the tractor and is getting weak.  Any way to safely charge
> it in the shop?  Use a 12 volt charger at low rate?
>
> Thanks
>
> Phil Kelley
> North GA
>
>
> ----- Original Message ----- 
> From: "Bill Brueck" <b2 at chooka.net>
> To: "Antique John Deere mailing list"
> <antique-johndeere at lists.antique-tractor.com>
> Sent: Sunday, September 05, 2004 11:28 PM
> Subject: Re: [AJD] 8 Volt Batteries
>
>
> > This was a pretty common aftermarket boost for 6 volt systems.  You
bought
> 8
> > volt bulbs for any lights, put in the battery, and boosted the voltage
> > regulator a bit so it would charge.
> >
> > I work on my father in law's Farmall H with this system from time to
time.
> > It was upgraded before my time.
> >
> > B²
> > Bill Brueck (brick)
> > Chatfield, Minnesota USA
> >
> > Confusion is a higher state of knowledge than ignorance.
> > ----- Original Message ----- 
> > From: "Kevin Smolkowski" <kev at smolkowski.com>
> > To: "Antique John Deere mailing list"
> > <antique-johndeere at lists.antique-tractor.com>
> > Sent: Sunday, September 05, 2004 9:51 PM
> > Subject: [AJD] 8 Volt Batteries
> >
> >
> > >
> > > While we are on the subject of MC's and Voltages...
> > >
> > > I picked up another MC the other day and compared to others
> > > it seemed to spin around pretty good using the started.  At first
> > > I thought that someone put in a 12V battery but it had the original
> > > generator and it was charging.  I looked closer and it had a 8v
> > > battery.
> > >
> > > Was this a common thing?   Seems to work well enough that I am going
> > > to leave it that way.
> > > --
> > > Kevin Smolkowski
> > > John Deere Model R
> > > visit: www.twocylinderdiesel.com
> > > _______________________________________________
> > > Antique-johndeere mailing list
> > > http://www.antique-tractor.com/mailman/listinfo/antique-johndeere
> > >
> >
> > _______________________________________________
> > Antique-johndeere mailing list
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> >
>
>
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