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John Deere Tractors Discussion Forum
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24 volt 3020

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John51

04-04-2005 17:56:59




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Yes, I know this has been the topic before but I just purchased my 3020 so it's all new to me. Everything works good but the batteries (new and both good) drain down in about 5 days of sitting. Where do I start? Where are the 12 volts for the lights, etc taken off the system? From one of the leads to the starer? What are the two gizmos on the starter with the wires coming off? Maybe the question I should ask is how do I get a wiring diagram? Thanks.

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txgrn

04-05-2005 06:59:26




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 Re: 24 volt 3020 in reply to John51, 04-04-2005 17:56:59  
Didn't read other posts here. I have read others post about the starter windings shorting out to the case, cause of all the crud in the starter which will drain the batt over time. The windings are supposed to be isolated.

Mark



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Mike M

04-05-2005 06:50:34




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 Re: 24 volt 3020 in reply to John51, 04-04-2005 17:56:59  
Welcome to the wonderful wackey world of 24 V systems. And just think the auto industry wants to switch over to 36 V running at 42 V. I once helped a friend track his drain down.He had a fuse at the left battery that would blow. We started unhookin things until it quit doing it.Turns out it was in the starter (last thing left to unhook) I would suggest to start at the starter as the field coils are hot all the time and moisture seems to make them bleed to ground.If you have never worked on starters before you may be better off having it tested by a rebuilding shop.

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Tx Jim

04-05-2005 04:20:01




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 gizmos???? in reply to John51, 04-04-2005 17:56:59  
John,the gizmos are probably cicuit breakers.The 24v's are split at the key and light switches.Each have posts marked battery A&B.A good place to look for a drain is the starter.Many 24v starters had shorts(grounds) in them.Jim



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Gerald J.

04-04-2005 20:46:06




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 Re: 24 volt 3020 in reply to John51, 04-04-2005 17:56:59  
Half the lights come off the +12 and half come off the -12. The center of the battery and the light commons all connect to the frame.

Wiring diagram is in the I&T manual, the Deere Shop manual and the Deere parts catalog. Your nearest JD parts counter can print off the wiring diagram from the manual. Different vintages will have different wiring diagrams.

Gerald J.



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buickanddeere

04-04-2005 19:31:57




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 Re: 24 volt 3020 in reply to John51, 04-04-2005 17:56:59  
Try a DC ammeter when the tractor and electrical laods are shut off. Measure current in both main cables leaving the batteries. And measure the current in the "ground" wire the mid point between the batteries.



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hogman_2002

04-04-2005 20:45:16




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 Re: 24 volt 3020 in reply to buickanddeere, 04-04-2005 19:31:57  
You can go to JDPARTS and find a wiring diagram. Do you batteries have a cable connecting them together in series? You are suppose to have the positive from one battery going to the starter and the negative grounding to the frame of the tractor. The other battery should have the negative going to the starter and the positive being "grounded" to the frame. If you get a volt meter you should have around 12.6 volts to the key switch. If you have around 25 volts to the key switch your batteries are in series thus giving you 25 volts.

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JOhn51

04-05-2005 11:00:14




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 Thanks! in reply to hogman_2002, 04-04-2005 20:45:16  
Thanks for all the help. I got the diagram off JDParts and now I'll start testing individual circuits as I go. It may vey well be the starter.



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