Best starter to use with J. D. 4020 24v to 12v conversion?

1964 John Deere 4020 22T ser. 79,000. Diesel 404 engine.
Existing system is the 24v split circuit/floating ground type.
I would value your suggestions and experience with successful 12v conversions.
What starter brand/number worked well for you? Did you have any trouble hooking up the lights, etc.?
I plan on using a Delco 'one wire' alternator on the unit.
 

I've read Iskra starters are very good. To supply 12 volts to lights just attach both brown & blue wires at starter to top post on starter solenoid.

Iskra P/N IS0663 Voltage 12 V Power 4.0 kW

http://mascostartersandalternators.com/Sunshop/index.php?
 
(quoted from post at 04:09:42 06/16/16)
I've read Iskra starters are very good. To supply 12 volts to lights just attach both brown & blue wires at starter to top post on starter solenoid.

Iskra P/N IS0663 Voltage 12 V Power 4.0 kW

http://mascostartersandalternators.com/Sunshop/index.php?
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Awesome! Thanks for the information. It would be nice to have a simple system that I can install a disconnect switch on. The 24v system is working fine @ this time, but @ the first sign of serious trouble I will convert the ol' boy.
 

You could install a disconnect switch on both of the battery cables on the 24 volt system but installing switch on RH cable would probably stop elect drain. For a user friendly tractor I think changing to 12 volt system is the only way to go.
 

Aye. The manual says to 'polarize' the generator anytime the system is worked on. This would be a pain with a disconnect switch installed. This great tractor is not used often, but I would hate to lose it to a fire.
 
If you have a lamp for a charge indicator you will lose that function with a one wire Delco. Get the 3 wire and connect generator side of the lamp to #1 pin on Delco alternator. Loop #2 pin down to output stud
 
The best way to deal with a 24 volt system is to convert it to 12 volt, Now, the best starter to use is the Nipendenso, and it is the highest priced one,, the next choice is the Iskra, a good dependable starter and a bit cheaper, go to the one wire Delco alternator, forget about the charging lamp, you can check to see if it's charging by holding your knife blade to the rear bearing area if it's magnetic it's charging switch the fuel gauge and change a couple wires and all will be good...the 24 volt system is like an old light bulb,, okay today but you can't bet on tomorrow...
 
And another thing that helps is to wire a starter relay into the system. Makes for better and crisper starting, not to mention better dependability. Mike
 
Yes Mike that is just about a necessity, and I mount mine under the left side cowl, easy to get to and out of the way.
 
Call Green Magazine and ask them to send you my three articles on the Deere-Delco 24 Volt System. The articles explain how the system works as well as trouble shooting. Full-fielding and polarizing the system are also covered. Disconnecting the battery does not require polarization as the cutout relay in the voltage regulator automatically disconnects the battery every time the tractor is shut off. Deere used the 24 Volt System on diesel tractors for 11 years. Lack of knowledge of the 24 Volt System is a poor and expensive reason to eliminate it.
 
All true, but the article will not talk about how a minor short in a stater or generator will blow all your lights like flash cubes..or how to hook up a bale monitor or radio...with out drawing one battery down,, the only good reason for keeping it is if you want to show as it was...
 
(quoted from post at 14:58:11 06/16/16) Lack of knowledge of the 24 Volt System is a poor and expensive reason to eliminate it.

Joe
I beg to disagree with you. I'm fairly knowledgeable on JD's 24 volt electrical system having served as a JD dealer service manager from '74-'87 and I promise you I'd change a JD 24 volt to 12 volt if I planned on using the tractor regularly. I helped diagnose/repair many 24 volt systems malfunctions during my tenure.
Jim
 
(quoted from post at 11:58:11 06/16/16) [Disconnecting the battery does not require polarization as the cutout relay in the voltage regulator automatically disconnects the battery every time the tractor is shut off.]

Joe: Thank you for the information on the polarization. I don't plan on a changeover until something goes seriously wrong.

Some of the seeming advantages of changing from 24v to 12v are as follows:
1 Ability to add or remove load with out fear of imbalanced batteries.
2 The ability to place a safety disconnect switch in the battery circuit.
3 A reliable, easy to repair Delco with internal regulator instead of the generator with external regulator. This tractor won't see work in the dust again, so the Delco should last.
 
(quoted from post at 08:52:26 06/16/16) And another thing that helps is to wire a starter relay into the system. Makes for better and crisper starting, not to mention better dependability. Mike

Mike: Adding a starting relay to the system is a new concept to me.

Pray tell, does this connect the signal from the key switch to the starter solenoid? Is this intended to improve the stock tractor or the modified one?

Thanks a bunch for your reply.
 

Yes relay was inserted on wire between key switch & starter solenoid. Relay provided stater solenoid more direct source of higher amp activation electricity for better solenoid engagement. JD engineers stated utilizing the starter relay concept on tractor when they changed rowcrop tractors from 24 volt to 12 volt. JD utility of similar time frame also utilized starter relays but I can't remember exactly when. JD offered a kit to add solenoid as shown in photo below.

36975.jpg
 
(quoted from post at 10:27:24 06/16/16) The best way to deal with a 24 volt system is to convert it to 12 volt, Now, the best starter to use is the Nipendenso, and it is the highest priced one,, the next choice is the Iskra, a good dependable starter and a bit cheaper, go to the one wire Delco alternator, forget about the charging lamp, you can check to see if it's charging by holding your knife blade to the rear bearing area if it's magnetic it's charging switch the fuel gauge and change a couple wires and all will be good...the 24 volt system is like an old light bulb,, okay today but you can't bet on tomorrow...

Tim do you have a Part # and or source for the Nippendenso Starter for a 4020? Also do you Info on relay kits to be used with these starters?
 
Does anyone have a Part # and or source for the Nippendenso Starter for a 4020? Also Info on relay kits to be used with these starters?
 
(quoted from post at 10:03:45 06/20/16) Does anyone have a Part # and or source for the Nippendenso Starter for a 4020? Also Info on relay kits to be used with these starters?

Do a search here for Denso 4KW or Denso 5KW.
 
(quoted from post at 10:03:45 06/20/16) Does anyone have a Part # and or source for the Nippendenso Starter for a 4020? Also Info on relay kits to be used with these starters?

Here's a part number that appeared from a search with Google.
The Denso part # is 028000-3292 and the reman # is RE13722
 
(quoted from post at 12:38:28 06/20/16)
(quoted from post at 10:03:45 06/20/16) Does anyone have a Part # and or source for the Nippendenso Starter for a 4020? Also Info on relay kits to be used with these starters?

Here's a part number that appeared from a search with Google.
The Denso part # is 028000-3292 and the reman # is RE13722

Thank you Tx Jim that is very helpful.
 

The JD part number for the 12V 5KW Denso gear reduction starter is RE528619 . That should cross reference into a remain or generic replacement.
To be honest I don't know if the 5KW Denso will clear the early log style intake manifold.
This is also the time to install a $15 hydraulic pump destroker .
 
(quoted from post at 21:30:13 06/20/16)

This is also the time to install a $15 hydraulic pump destroker .

I have always had the destroker. This is not a problem starting it is a project to convert from 24v to 12v when and if 24v starter and/or Gen/Reg die.
 

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