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Geo-TH two batteries question answered

J

JMOR

Well-known Member
Location
TX
Geo-TH,In wrote:

I'm wondering if there is a way to use 2 6v batteries. During
starting, put the two batteries in series, 12v only going to the
starter. Then when running the 2 batteries are in parallel and
charger off the old generator?

Not 100%, I think something like this was done on some tractors
using two 12v batteries. 24 volts to starter only and put both
batteries in parallel for charging.

JMOR: Yes J Deere did, but starter did NOT use chassis as ground. Probably could still be done on your tractor, but more high current relays would likely be involved, or a seriously modified starter.
qfj9voO.jpg

5BPODjN.jpg
 
Years ago JCWhitney sold a series/parallel relay. With it all battery cable were wired to it and then there were output terminals that went to ground and the starter. I can't remember exactly how it was. Anyway with it you could have the batteries in parallel (12v) like normal and for starting it would put them in series (24v) I tried it on my JD4020 for a while and it worked good. Since then I changed it over to normal 12v.

I just tried looking for it and couldn't find it but this seems like it's similar
RELAY
 
JMOR,


Yes you need a series parallel
switch.

Here is one,

Guido.
<img
src=https://www.yesterdaystractors.com/cvphotos/cvphoto141088.jpg>

<img
src=https://www.yesterdaystractors.com/cvphotos/cvphoto141089.jpg>
 
Thanks Jessie.
I thought John Deere used a 24v starter and 12v system. I think
it could be done another way with the right relays, if one could
find 6v heavy duty relays. That would save a lot of time
converting 6v to 12v on an old truck.

When I was in college I had a poor man's porsche, a karmann
ghia. It was 6v if I recall. I put a 12v battery in the engine
compartment to power a 12v radio and would use a battery charger
to recharge the 12v battery. A poor man has to do what he can
afford.
 
+those parrelelle switches were a pita in freightliners.they would stick,charge either the positive side batterys or the negative side. shut er off lights be bright but no start
 
I had a rig like that on a '48 Dodge farm truck.

Can't remember exactly how it worked, but it used two six volt batteries, and a solenoid put them in series for 12 volts to the starter, but left everything else six volt.
 
Those Deere tractors with that nonsense had their problems and were soon converted by the owners to 12 volt straight through. I'm sure there are some dyed in the wool fans that still have a few of that cock a maimie set up on them yet.
 
(quoted from post at 07:33:26 11/21/22) So it has been done.
Click to expand...
f you should pursue that switch, be sure you get the correct switch (6,12,24). I think Woreout linked the correct 6v sw, but the others are unknown to me.
 
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