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Restoration & Repair Tips Board

JD 3010 battery cable set up

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Farmman73

04-04-2007 11:17:20




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My 3010 has a 24 volt system and the batteries are set up as follows sitting in seat:
Right hand-Postive to bolt on side of starter, negative to frame ground.
Left hand-Postive to frame ground, negative to starter solenoid.

Can I connect the left postive post to the right ground to set the batteries in series with not ground to the frame. My neighbor has a 3020 set up this way. Which way is best. I am confused because my neighbor thinks my set up is wrong and I want to get it correct. Haven't had a problem with cranking when batteries are good. But They seem to melt the battery post is there is not a good ground. Would setting up in series help this.

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Jon Hagen

04-04-2007 13:28:33




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 Re: JD 3010 battery cable set up in reply to Farmman73, 04-04-2007 11:17:20  
There is really nothing wrong with the way your batteries are connected to the tractor frame except you are a bit more at risk of a fire if the insulation in the starter fails, or conductive brush dust builds up too much inside it. The problem is that the armature and fields in that isolated starter are always 12 Volt hot in relation to the battery that connects to the stud bolt on the side of the starter and the tractor frame. The stock setup has an insulated jumper cable between the rear two battery posts,with only a little 10-12 GA wire from that heavy cable to the tractor frame. The idea is that if the starter shorts to frame ground, that little 10-12 GA wire will burn off and break the connection before anything heats up enough to start a fire. In many of those older 24V tractors I have seen an automatic reset breaker or fuse installed in that little frame ground wire to blow before any thing gets damaged. By connecting the heavy rear battery cables to the frame,you eliminate this little "weakest link" ground wire which allows the full amperage of one battery to short to ground through a defective starter.

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Jon Hagen

04-04-2007 13:35:06




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 Re: JD 3010 battery cable set up in reply to Jon Hagen, 04-04-2007 13:28:33  
I forgot to add that the reason for that little wire from the center point of the series wired pair of 12V batteries is to allow 12Volt accessories to be connected to frame ground and either of the battery cables at the starter to supply 12V pos from one cable to ground, and 12V neg to ground from the other.



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