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John Deere Tractors Discussion Forum
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Re: 4020 gen and oil light on dim when tractor is off

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Tx Jim

05-09-2013 04:16:58
67.142.163.27



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You can view wiring diagram for a 4010 here and it will be very similar to 4020 http://www.geocities.com/gwece/deere/. Is ground wire on LH rear battery post to frame intact and has good connections? You can pull starter end cap off starter and check for brush dust without removing starter from tractor.




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dweitzel

05-09-2013 20:36:33
208.102.68.119



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 Re: 4020 gen and oil light on dim when tractor is off in reply to Tx Jim, 05-09-2013 04:16:58  
Yes, the ground wire is on the LH battery and connected good to the frame.

I pulled all the wires one at a time from the key switch and the light switch. No change. The 2 lights were still on dim.

I pulled all 3 wires from the Generator. The "A1" wire made both lights go out. Other 2 wires made no difference.

"A1" connects to the middle post on the regulator, and also to the "Gen" light and then to the "Gen" connector on the key switch. Again, unhooking all the wires (one at a time) from the key switch had no change on the lights.

Since "A2" and "F" on the generator had no change on the lights, but "A1" did, it appears to me the generator is the problem? Could the ground (Positive from RH battery), be coming through generator to the "A1" terminal on the generator?

On a side note, I ran the tractor up and down the road, came back and turned it off the the lights are now off?

Any ideas?

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John T

05-10-2013 04:25:52
216.249.82.117



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 Re: 4020 gen and oil light on dim when tractor is off in reply to dweitzel, 05-09-2013 20:36:33  
The genny and VR connections are all across the 24 volt series sum and (if alls well?????) should have nothing to do with frame ground. The reason theres an A1 and A2 is so neither has a frame ground connection like on a 12 volt system with only a single A terminal because the other brush (which would be A2) is grounded.

If unhooking wires and/or road vibration seemed to get things working, Id be thinking of a loose or corroded connection problem or perhaps theres an internal genny problem (brushes, brush holders, field or its splice etc)

These 24 volt systems are hard to diagnose if there armed with a VOM let alone over the internet so sorry, I just cant say sittng here if its a genny or VR or wiring problem, but if shes NOT charging the idiot light is supposed to be on, its sort of like a light wired across the VR's internal cutout relay where if the gennys output (A1 and A2) is coupled up to the battery the voltages are the same so the light goes out.

I DONT KNOW SITTING HERE WHATS WRONG maybe Tx Jim does?? Hes sharp as a tack on these and I havent sold or worked on them for years grrrrrrr

John T

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Tx Jim

05-10-2013 04:56:14
67.142.163.20



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 Re: 4020 gen and oil light on dim when tractor is off in reply to John T, 05-10-2013 04:25:52  
Quoting Removed, click Modern View to see

John

You have my 24 V knowledge all wrong. I'm sharp as a "bowling ball" on 24V systems. As I've stated in the past there are other people on this forum including YOU that know more about the 24 V system than me.

Jim



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John T

05-10-2013 05:16:41
216.249.82.117



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 Re: 4020 gen and oil light on dim when tractor is off in reply to Tx Jim, 05-10-2013 04:56:14  
Hmmmmmmmm "sharp as a bowling ball" not sure I can top that or not lol

Shoot me an e mail sometime

John T jmn50@msn.com



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Tx Jim

05-10-2013 04:49:57
67.142.163.20



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 Re: 4020 gen and oil light on dim when tractor is off in reply to John T, 05-10-2013 04:25:52  
24 V charging system problems always gave me fits. Have you checked starter for brush dust?? The brush dust can cause elect system to do crazy things. IIRC the generator fields or brush mounting post can ground out. With wires attached to VR & genny try to isolate genny from mounting bolts.IE hold in your hand. If this tractor was MY tractor and not a collector project I'd spend about $400 and change it to 12 V's. Changing from 24 V's to 12 V's will save you from having a lot of GREY HAIRS.

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jsborn

05-18-2013 13:37:19
209.164.254.35



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 Re: 4020 gen and oil light on dim when tractor is off in reply to Tx Jim, 05-10-2013 04:49:57  
Quoting Removed, click Modern View to see

How is the best way to Check for brush dust and clean it if it needs to be cleaned??
Can the end plate on the starter be removed and reinstalled on the tractor with out any problems? ie bearing alignment and springs and stuff coming out. :oops:



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Tx Jim

05-18-2013 14:46:52
69.35.163.57



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 Re: 4020 gen and oil light on dim when tractor is off in reply to jsborn, 05-18-2013 13:37:19  
The starter end cap can be removed with starter attached to tractor. The brush holders/springs are attached to starter body. Only difficult thing would be getting the 2 screws started back in their threaded holes. End cap has a bushing in it no brg.



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John T

05-09-2013 13:37:23
216.249.82.117



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 Re: 4020 gen and oil light on dim when tractor is off in reply to Tx Jim, 05-09-2013 04:16:58  
Its been years since I sold used tractors and all that 24 volt stuff and I didnt remember if that starter end cap was easily removed in place. You and I both seem to always ask about that frame ground connection.

Im headed to Austin for the month of October and I want 70 degree days and cool nights as I will be doing some dry camping!!!!!!!!!!

John T



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