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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: Evaluating a previous 12v conversion on a 4020

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Bob Bancroft

03-05-2013 07:34:42
97.73.64.143



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I wouldn't say so. It sounds like your biggest challenge is what was done by whoever was there before you. Did they cob the old harness, run individual wires, or what? The best place to ground the battery is right back to the starter frame.




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Tx Jim

03-05-2013 09:47:41
67.142.163.20



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 Re: Evaluating a previous 12v conversion on a 4020 in reply to Bob Bancroft, 03-05-2013 07:34:42  
Be sure that both the brown & blue wires in the harness(original 24V) at the starter are attached to the top post on the starter solenoid. I would also install the extra starter relay if one already wasn't there.
This post was edited by Tx Jim at 09:49:35 03/05/13.



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belaw

03-05-2013 14:11:21
70.183.219.154



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 Re: Evaluating a previous 12v conversion on a 4020 in reply to Tx Jim, 03-05-2013 09:47:41  

Tx Jim said: (quoted from post at 10:47:41 03/05/13) I would also install the extra starter relay if one already wasn't there.


Okay, I'm going to show my ignorance of diesel and/or tractor electronics, but what does the "extra" starter relay do? Where does it go- between the battery and solenoid?

Maybe I'm stuck thinking in terms of automotive electrical systems, but I just can't figure why you would need a relay in addition to the starter solenoid!
Brian
This post was edited by belaw at 14:12:47 03/05/13.

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Tx Jim

03-05-2013 15:35:16
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 Re: Evaluating a previous 12v conversion on a 4020 in reply to belaw, 03-05-2013 14:11:21  
The starter relay that JD adopted for later model tractors relieves some of the elect. load on the ing & neutral starting switches and allows for more amps(voltage) to be transferred to the excite wire(yellow colored) on the starter solenoid IE better starter operation. Here's an example of a relay kit but it came out of a JD utility parts catalog instead of a rowcrop but the principle is the same.
This post was edited by Tx Jim at 15:43:33 03/05/13.

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Brent in WI

03-05-2013 16:21:15
68.113.232.205



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 Re: Evaluating a previous 12v conversion on a 4020 in reply to Tx Jim, 03-05-2013 15:35:16  
TX Jim is 100% correct as the second starter relay makes a big improvement. I converted my 3020 and it intermitantly would just click. I spent hours going through all the contacts with minimal luck. I then put in a second relay and it starts every time now. I think the contacts get enough corrosion after 40 years and just won't carry the load as well. I did the same thing to a 2510 and it made a big difference there too.

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belaw

03-05-2013 17:27:13
99.188.189.169



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 Re: Evaluating a previous 12v conversion on a 4020 in reply to Brent in WI, 03-05-2013 16:21:15  
Quoting Removed, click Modern View to see

So the point of the "extra" relay is to make sure that enough juice flows to trigger the solenoid when the starter button is pressed? I need to keep telling myself this isn't a small block Chevy....

Is there a specific relay recommended for this application, or will your basic automotive cube relay handle the load?

Brian

P.S. This forum is great!

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Brent in WI

03-05-2013 18:07:14
68.113.232.205



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 Re: Evaluating a previous 12v conversion on a 4020 in reply to belaw, 03-05-2013 17:27:13  
Correct. I don't remember what amp rating of a relay I bought but the heavier duty the better considering it's a tractor.



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