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4020 charging system

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chris

10-07-2001 15:00:37




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have a 4020 that does not charge wondering if any body can help. It has a altnator on it. My questian is that it does not charge but the altnator is putting out power but the gauge does not say it is. i've have put a new gauge on it and it does not work yet.




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Bill

10-08-2001 21:15:13




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 Re: 4020 charging system in reply to chris, 10-07-2001 15:00:37  
Those tractors with that 12/24v system are a ---- nightmare. The tractor actually has two complete electrical systems - one positive ground and one negative ground. All of the accesories have to be balanced between the two systems for current draw ,ie. some of the lights will be operating with the positive ground system while the rest will be operating negative ground. Guys pulling combines with electric controls(-because the whole combine has to run off one side of the system-usually neg. grd side) had so much trouble with one of the batteries always going dead that a lot of them switch them back to a straight 12v system. The alt charges through two output leads - one positive , one neg ,but the ammeter only reads the one side, that's why I say its probably the fuse at the batt or do you have the relay system - I am not familiar with them by year. The alt. only reads the batt. voltage from the one system ,but puts the same amount of charge current to both batt.,so if the draw on the batteries is not equal , one batt. gets charged up enough and the other one ends up either over charged or going dead- not one of JD's better ideas.

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chris

10-09-2001 15:45:54




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 Re: Re: 4020 charging system in reply to Bill, 10-08-2001 21:15:13  
I was just wondering, I was looking for that fuse and I could not find that fuse I got to looking and I noticed that both batries were negative grounded wondering is that would cause it not to charge



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Bill

10-11-2001 21:05:51




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 Re: Re: Re: 4020 charging system in reply to chris, 10-09-2001 15:45:54  
On second thought if both batt. are grounded to frame the system has to be running on straight 12v What kind of an alternator does it have on it? My guess is that someone has changed the system to straight 12v but didn't do a complete job of it.



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Bill

10-11-2001 19:38:42




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 Re: Re: Re: 4020 charging system in reply to chris, 10-09-2001 15:45:54  
Does the tractor crank over good and start ok? If it does ,it either must have a 12v starter on it - or one batt.has got charged up backwards. Originally the one batt. is grounded to frame and the other one has both cables going to the starter to create the series hookup fo 24v. The fuse is a Special time lapse fuse (a ordinary fuse won,t work because it blows a regular one as soon as you crank the engine over

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Bill

10-07-2001 23:31:29




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 Re: 4020 charging system in reply to chris, 10-07-2001 15:00:37  
Are you working on a straight 12V system or is it a diesel with the 12/24V system? If it is the latter, check the special fuse on the left batt.



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chris

10-08-2001 19:19:27




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 Re: Re: 4020 charging system in reply to Bill, 10-07-2001 23:31:29  
This is a 1968 4020 and it runs a 12 volt altnator
but it is a 24 volt system



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Bob

10-07-2001 21:34:03




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 Re: 4020 charging system in reply to chris, 10-07-2001 15:00:37  
The alternator should have 3 wires on the back of it. One wire by itself probably red in color on a stud with a 10mm nut should have 12V constant power. There should be two other wires on a pigtail that plug into the alternator. One is 12v constant and the other is 12V keyed power. On the back of the alternator it should be labeled which wire goes where. ig, I, 1, meaning ignition or keyed power. It is important not to get these two wires crossed. It will still charge but eventually cause the alternator to run the batterys down when not in use. These wires should go back to a solenoid by the firewall. Your guage should read from this solenoid. Then the charge goes from the solenoid down to the starter solenoid and back to the batteries. The output terminal on the alternator is the one with the single wire on a stud with a 10mm nut. Check for voltage and continuity in these wires. If they have lost continuity then you can run new wires along the old harness. Hope this helps.

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