420-crawler new voltage regulator 6 volts

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allenjohn
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420-crawler new voltage regulator 6 volts

Post by allenjohn » Tue Feb 01, 2022 10:20 am

6 volts positive ground do I need to polarize this new regulator. if so I put a jumper wire between "BAT" TERMINAL TO "GEN" OR "ARM" A SMALL SPARK WILL OCCUR JOB COMPLETE PLEASE ADVISE THANKS !

dtoots1
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Re: 420-crawler new voltage regulator 6 volts

Post by dtoots1 » Tue Feb 01, 2022 1:32 pm

Actually you are to polarize he "battery"....and that is exactly what i did on my jd40s..wheeled as voltage regulator is buried in console...just be sure that wire is connected to ..bat.. on voltage regulator and reaches the generator..i use alligator clip to hold until needed...do you have book instructions or google it..here it is....touch that wire to the field terminal on the generator...should get a spark...start her up and check see what your ammeter shows...should either be charging or holding steady if battery is fully charged

just checked ongoogle and that leaves a lot to be desired

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Re: 420-crawler new voltage regulator 6 volts

Post by Buckhorn » Tue Feb 01, 2022 3:00 pm

According to everything I have read, you nee to polarize anytime the system has been worked on, especially when the battery has been disconnected.
Here is some good information that I found, when I recently changed the regulator on my JD 40U.

http://chevy.oldcarmanualproject.com/el ... /index.htm

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Re: 420-crawler new voltage regulator 6 volts

Post by Jim B » Tue Feb 01, 2022 4:48 pm

The generator is what is being polarized. Generators can produce current flow in either the positive or negative ground direction. The polarization process assures the electrical flow from the generator is in the proper direction to charge the battery. It used to be that some regulators were specified as being only for positive or negative ground systems. I'm not sure on the current ones, been years since I bought a voltage regulator for a generator, but it is something to check when purchasing a regulator.

The Delco Remy generator on your 420 should be an "A" type generator. Here is a picture of how to polarize an "A" type generator from one of my Delco Remy training manuals (from a few years back, [time flies its 50 this summer}, when generators were the norm). HTH
Jim
Image

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Re: 420-crawler new voltage regulator 6 volts

Post by Buckhorn » Tue Feb 01, 2022 9:01 pm

The easiest place to connect a jumper wire to polarize the generator, is to connect from the battery terminal on the starter, to the armature terminal on the generator. The regulator is buried behind the dash, and it's hard to get to the terminals. The armature terminal should have an 'A' stamped into the case, and if it's was originally wired with a black wire. The field terminal should have a white wire.

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Re: 420-crawler new voltage regulator 6 volts

Post by Jim B » Tue Feb 01, 2022 9:37 pm

I agree with you, using a jumper between the battery stud on the starter and the armature terminal is easier on a 420, than reaching the regulator.

To better answer allenjohn's original question on this post; a regulator, new or used, does not get polarized.

A generator is what gets polarized. On a new/replacement generator polarizing is required to match the generator to the system ground. If the residual magnetism in a generator is poor, polarizing the existing generator may help bring the generator back to life.
Jim

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Stan Disbrow
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Re: 420-crawler new voltage regulator 6 volts

Post by Stan Disbrow » Wed Feb 02, 2022 5:36 am

Hi,

There are mild steel plates associated with the field coils in a generator. What you are doing is making them into a mild permanent magnet. Setting one end North and the other end South. Like the poles on the planet. Hence the term Polarization.

That is where the initial magnetic field comes from to get the generator going. The field coils boost that mag field. But if the initial field isn't there, no generation.

The electromechanical regulator doesn't care if it is positive or negative ground. Only the battery and generator care. And if one or the other is backwards, then the generator will suck power out of the battery instead of putting it in.

Over time, the mild permanent magnatism in the generator fades away. So, repolarization is sometimes required.

Stan
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Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

dtoots1
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Re: 420-crawler new voltage regulator 6 volts

Post by dtoots1 » Wed Feb 02, 2022 10:30 am

Actually what is ultimately accomplished is that BOTH the battery and generator are being matched to the system that is being used on the machine..the generator will charge either system (+ or -), when hooked up properly for that machine set up and polarized...IRC the 12 volt generators also need to be polarized for that system as well.

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Stan Disbrow
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Re: 420-crawler new voltage regulator 6 volts

Post by Stan Disbrow » Thu Feb 03, 2022 5:29 am

Hi,

Yep. Regardless of voltage, a generator needs to be polarized to match which side of the battery is used for ground. 6, 12 or 24. And there were some 32, 36 and 48 volt as well. Just not on our machines we chat about here.

The norm is 6v is positive ground and 12v is negative ground. But the earliest 12v systems were positive ground like the 6v was. But I don't recall Deere having ever used 12v positive ground. Actually, Deere was very late to the 12v party by which time I think everyone else had already gone negative ground for 12v. The 12v party began just after WWII.

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

dtoots1
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Re: 420-crawler new voltage regulator 6 volts

Post by dtoots1 » Thu Feb 03, 2022 9:22 am

Hey STAN<
I cannot remember if 12 volt system also needs the RESISTER or coil with resister built in? Seems to me the resisters keep voltage to 6 volts??? not sure...am hooking 12 volt generator up on Farmall H

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Stan Disbrow
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Re: 420-crawler new voltage regulator 6 volts

Post by Stan Disbrow » Fri Feb 04, 2022 5:35 am

Hi,

Yes, you need a resistor if you are keeping the original coil. Or you can change it to a 12v coil.

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

dtoots1
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Re: 420-crawler new voltage regulator 6 volts

Post by dtoots1 » Fri Feb 04, 2022 12:19 pm

would that be a 12volt coil with resister built in?...am changing over from alternator as generator fits under hood...alternator forced cut out of hood.....believe was 6 volt in beginning and changed to 12volt w/alternator..which got destroyed. cannot remember if old resister still there

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Stan Disbrow
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Re: 420-crawler new voltage regulator 6 volts

Post by Stan Disbrow » Sat Feb 05, 2022 5:49 am

Hi,

Some 12v coils are wound 12v. Some are wound 6v with a resistor inside. Doesn't matter as either way results in being happy on 12v.

What is unhappy is being wound as 6v and not having a resistor and then fed 12v.

Many old car coils are 6v with a resistor so that resistor can be bypassed when the starter is engaged. This can be an external resistor and the bypassing done using the ignition switch. Or, can be internal with a third terminal for the starting bypass. And sometimes that is fed from a terminal on the starter solenoid.

We don't tend to play the starter load compensation game on our old iron. So it is best to get a coil wound for 12v or use the original 6v coil with an external resistor.

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

dtoots1
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Re: 420-crawler new voltage regulator 6 volts

Post by dtoots1 » Sat Feb 05, 2022 9:42 am

So resister actually kicks it up to 12 volts and everything happy! Sorta
Thanks for clearing up

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