Anonymous-0
Well-known Member
How can I charge the two 12 volt batteries in my tractor without disconnecting the cables and charging them separately? Thanks
- Thread starter Anonymous-0
- Start date
Uncle Ernie
Member
depends on how they are connected. If connected in series,tractor to pos,neg to positive then neg to ground they are connected as to be 24 volt and should be disconnected from each other and charged individually unless you have a 24V charger.
If they are parralel, pos to pos, neg to neg, then they are connected as 12 v and should still be disconnected and charged individually although you can leave then connected and try charging them together.
If they are parralel, pos to pos, neg to neg, then they are connected as 12 v and should still be disconnected and charged individually although you can leave then connected and try charging them together.
Paul Janke
Member
If the tractor is a 24 volt system then the batteries are in series. You still don"t need to unhook them in order to charge them. Just put the charger on the terminals of the battery you are charging. When it is done, move the charger to the other battery.
If the batteries are connected in series, they can be individually charged with a 12V charger or simultaneously with a 24V charger withoug any disconnections.
If the batteries are connected in parallel they can be properly charged simultaneously with a 12V charger without disconnections if they are of the same type (as they should be). If they are not of the same type, they should be disconnected from one another and charged individually.
Dean
If the batteries are connected in parallel they can be properly charged simultaneously with a 12V charger without disconnections if they are of the same type (as they should be). If they are not of the same type, they should be disconnected from one another and charged individually.
Dean
greenbeanman in Kansas
Well-known Member
Bob, I'm scratching my head on your comment on that one. Why do you say that, will you explain please.
The connection on the solenoid would go directly to the positive posts of the batteries via the cable and the ground cable would lead directly to the negative battery posts IF the system is a negative ground. That's my take.
The connection on the solenoid would go directly to the positive posts of the batteries via the cable and the ground cable would lead directly to the negative battery posts IF the system is a negative ground. That's my take.
FWIW I agree with the fine gents below: If your tractor batteries are connected in paralell simply hook the charger to one battery and the other will also be charged NO NEED TO DISCONNECT and if you do then only one will get charged.
If they are in series, you need to charge them one at a time unless you have a 24 volt charger and then you could charge both at once.
This isnt rocket science so dont make it any harder then it needs be.
John T
If they are in series, you need to charge them one at a time unless you have a 24 volt charger and then you could charge both at once.
This isnt rocket science so dont make it any harder then it needs be.
John T
Uncle Ernie
Member
A pair of 12v batteries in series will require a 24v charger to charge the pair. Disconnected they are each once again 12v and can be charged with a 12v charger.In practice you probably could charge them still connected to each other individually one at a time with a 12 v charger as long as they are disconnected from the vechicle.
In parallel the batteries should be disconnected in case one of the batteries is defective, which may be why he has to charge them in the first place.
No wives tales involved. Aunt Ernie cannot charge a battery for beans...
In parallel the batteries should be disconnected in case one of the batteries is defective, which may be why he has to charge them in the first place.
No wives tales involved. Aunt Ernie cannot charge a battery for beans...
evilboweivel
Member
slight disagreement
you can charge both at the same time if in series with 2 12 volt chargers
each charger hooks up correctly to each battery
positive ground tractor or negative ground tractor makes no difference as long as the chargers are hooked up + to + and _ to _ AT THE INDIVITUAL BATTERY
Ron
you can charge both at the same time if in series with 2 12 volt chargers
each charger hooks up correctly to each battery
positive ground tractor or negative ground tractor makes no difference as long as the chargers are hooked up + to + and _ to _ AT THE INDIVITUAL BATTERY
Ron
buickanddeere
Well-known Member
Depends. Can't see the application from here.
Having driven vehicles and used equipment with dual batteries, this is my experience.
If they are 2 12V batteries in parallel, I have found it best to charge them separately. I have found that often times one battery will be holding less than a full charge while the other battery is holding a full charge.
By charging them separately, you can be assured that both batteries are fully charged.
My thinking and understanding is that when one of the batteries reaches full charge the battery charger (or voltage regulator) will sense that the full battery voltage is reached and will stop charging.
Even though both batteries may be the same size and capacity, they will not have exactly the same charge/discharge rates and curves.
I know from experience that the p/u's I drive with dual batteries, I have obtained a longer battery life by once a year cleaning terminals, washing the battery outside and battery box with baking soda and charging each battery separately.
If it is 2 12V batteries in series, use either a 12V battery on each battery or a 24V battery charger. I am not sure, but I don't think hooking up 2 12V battery chargers to make a 24V battery charger would be a good idea.
hth
pkurilecz
PS: Your results may be different. Past results are no indication of future outcome. 8-D
If they are 2 12V batteries in parallel, I have found it best to charge them separately. I have found that often times one battery will be holding less than a full charge while the other battery is holding a full charge.
By charging them separately, you can be assured that both batteries are fully charged.
My thinking and understanding is that when one of the batteries reaches full charge the battery charger (or voltage regulator) will sense that the full battery voltage is reached and will stop charging.
Even though both batteries may be the same size and capacity, they will not have exactly the same charge/discharge rates and curves.
I know from experience that the p/u's I drive with dual batteries, I have obtained a longer battery life by once a year cleaning terminals, washing the battery outside and battery box with baking soda and charging each battery separately.
If it is 2 12V batteries in series, use either a 12V battery on each battery or a 24V battery charger. I am not sure, but I don't think hooking up 2 12V battery chargers to make a 24V battery charger would be a good idea.
hth
pkurilecz
PS: Your results may be different. Past results are no indication of future outcome. 8-D
Anonymous-0
Well-known Member
i aint tryin to be a smart mouth but why not disconnect them and charge separetly .they probably could use a good cleaning anyway.
just my 2 cents.
RICK
just my 2 cents.
RICK
MarkB_MI
Well-known Member
- Location
- Motown USA
If it's a 24 volt system, the batteries MUST be charged separately. But there's no need to disconnect them; just charge one then the other.
Brand/model of tractor?
24 volt series or 12 bolt parallel?
Why are they run down? Old? New? Same brand? Same age? bought as a pair? Connections clean? Sharging system problems on tractor?
Your question is like asking "should I paint my tractor green or red?" without telling the brand/model.
Tom
24 volt series or 12 bolt parallel?
Why are they run down? Old? New? Same brand? Same age? bought as a pair? Connections clean? Sharging system problems on tractor?
Your question is like asking "should I paint my tractor green or red?" without telling the brand/model.
Tom
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
May I ask what the brand/model of tractor has to do with how to properly charge a 12V battery?
Tx-Jim,
Since he didnt say or know wheather he has a 24 volt or 12 volt, and he didnt say or know if series or parallel, then a good start would be to know what his tractor is. You need some basic information to assist some of these folks, because they leave out most of the facts. Tom
Since he didnt say or know wheather he has a 24 volt or 12 volt, and he didnt say or know if series or parallel, then a good start would be to know what his tractor is. You need some basic information to assist some of these folks, because they leave out most of the facts. Tom
When I was working we charged (6)12volt batteries
that were connected in series/parallel for 24 volts. These were removed from the vehicle after making a cold start. A fully charged set were installed in the vehicle then cold soaked for 24 hours before making another start at -25F. This was the M60 tank. It was difficult to get that vehicle started at that temp since there was no way to preheat that 1790cid engine. Hal
that were connected in series/parallel for 24 volts. These were removed from the vehicle after making a cold start. A fully charged set were installed in the vehicle then cold soaked for 24 hours before making another start at -25F. This was the M60 tank. It was difficult to get that vehicle started at that temp since there was no way to preheat that 1790cid engine. Hal
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