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Tractor Talk Discussion Forum

hooking up two batteries in plow truck

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jbird

11-10-2006 12:35:16




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Hi,I know this is not tractor related,but i was thinking about adding a second battery to my farm plow truck,it has a western setup .Where should i run wire to or from? Are there any does or don'ts i should follow.




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the tractor vet

11-10-2006 18:13:55




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 Re: hooking up two batteries in plow truck in reply to jbird, 11-10-2006 12:35:16  
I plowed for 20 years with Ford F250's 4X4's and i ran a singal group 27 battery witheither a Myers or a Western plow on the ft and ran a 95 amp alt, now running all the lites with extra lites on the ft. and two 4411 sealed beams on the back for backup lites and the high output heater running full tilt plus a rotating sealed beam buddel gum on top i never had a problem with running out of juice . I also had a bunch of short lots with a lot of up and down right and left angel .

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comfortking

11-10-2006 16:38:01




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 Re: hooking up two batteries in plow truck in reply to jbird, 11-10-2006 12:35:16  
We tried this last year. Only thing we gained it took a little longer to drain both battries. what we are doing now is putting the second alt. and wiring together for the plow only. we were afraid the 150 amp alt would only burn belts.



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KEB

11-10-2006 14:54:13




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 Re: hooking up two batteries in plow truck in reply to jbird, 11-10-2006 12:35:16  
Depends on why you want two batteries. If its to increase starting current, then connect pos to pos and neg to neg as noted below. Just be aware that the batteries should be matched, i.e., the same size and roughly the same condition. Otherwise there will be potential problems with one dragging the other down.

If you want the second battery to power the snowplow, go to an RV store and get a battery isolator (or order one off the web). Both batteries will charge off the engine, but the second one will be disconnected when the engine is not running. The isolator will come with wiring instructions.

If you don't have to have the additional cranking capacity, isolating the second battery has the advantage of being able to give yourself a jump start, since the isolator will prevent the second battery from discharging if you do something like leave the lights on. Some RV's use a selenoid to accomplish this, but you can do the same thing with a jumper cable.

Keith

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GeorgeH

11-10-2006 16:58:27




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 Re: hooking up two batteries in plow truck in reply to KEB, 11-10-2006 14:54:13  
I essentially have this same setup on my motorhome. A solenoid connects the batteries in parallel when the key is on so you essentially get double batteries for starting (and for charging). When the key is off, the battery sets are discharged independently (I actually have two chassis batteries and two house batteries). Not good if one of four goes bad.



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buickanddeere

11-10-2006 20:50:14




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 Re: hooking up two batteries in plow truck in reply to GeorgeH, 11-10-2006 16:58:27  
Relay not a solenoid



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Georgeh

11-11-2006 04:49:24




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 Re: hooking up two batteries in plow truck in reply to buickanddeere, 11-10-2006 20:50:14  
Wiring diagram calls it a "battery mode solenoid" (just replaced it). You may be referring to the "battery disconnect relay" which shuts down house power.



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buickanddeere

11-11-2006 19:15:57




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 Re: hooking up two batteries in plow truck in reply to Georgeh, 11-11-2006 04:49:24  
A relay opens or closes contacts to break or allow the flow of current. A solenoid is an electrically operated device which pushes or pulls something.E.g electric door locks.



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coflyboy

11-10-2006 13:36:08




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 Re: hooking up two batteries in plow truck in reply to jbird, 11-10-2006 12:35:16  
If one battery developes a shorted cell, it will drag down and shorten the life of the remaining good one.



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Janicholson

11-10-2006 13:15:13




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 Re: hooking up two batteries in plow truck in reply to jbird, 11-10-2006 12:35:16  
Positive to positive, neg to neg.
Use #2 battery cables, as some of the starting current will be collected from there.
If the location is more than 3' away I would use 0 gauge cables, not #2.
Ground the Neg cable local at the battery with a 8 gauge stranded ground wire to the frame, and the Main ground to the engine block to a shiny metal connection.
The Pos cable should be attached to the starter motor at the same place as the original Pos cable is attached. This will allow both Batteries to crank the engine with full CCA.
If both batteries are good, it will not cause any system distress. JimN

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