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Ford 9N, 2N & 8N Discussion Forum

Polarization

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Tom N MS

06-10-2007 15:57:55

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My Dad recently had to buy a new battery for his 6V 2N as he has had to do several times over the last 40 years or so. Never had heard ol polarization so never has been done and not this time either..How would you know if it needs polarized?? Oh and don't say just do it, he is from Missouri,,,, not really but he wants an explanation and a reason for everything.

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Phil (NJ,AZ,SasK)

06-10-2007 22:20:43

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Re: Polarization in reply to Tom N MS, 06-10-2007 15:57:55

Tom N MS, When you polarize you are matching the Generator output polarity "to" the Battery polarity. If you are postive Ground your "Hot"
post is Negative and you want your Generator Output to also be Negative.

The Generator field circuit needs a sample of your "Hot" battery to create current flow in the correct direction. That current flow results in Residual Magnetism of the pole shoes that is in the correct North/South relationsahip. It is that Residual magnetism that starts your Generator Charging.

How often should you polarize? When ever in doubt, but if you have your generator repaired or replaced you should Polarize. If you are damaging your Regulator Cut-out.. polarize the Gen. I have not done mine in 10+ years

Just for those in Missouri! You never connect two
voltage sources (Batteries) -ve to +ve and then -ve to +ve (in series with each other) or you have a dead short. If the polarity of the Generator does not match the Battery the cut-out relay will be damaged (welded), the battery will win the war, but its a dumb way to polarize.

Hope this Helps,

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RP-40-9n

06-10-2007 18:30:33

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Re: Polarization in reply to Tom N MS, 06-10-2007 15:57:55

tom, if the ammeter dont work, you could pull the ground wire off battery while running and if it dies its not chargeing. time to polarise and check again. a tractor will run for days without the chargeing system working. RP

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Tom N MS

06-10-2007 18:50:11

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Re: Polarization in reply to RP-40-9n, 06-10-2007 18:30:33

Thanks. Didn't know they would run for days without charging but knew they would run at least all day on a good hot battery. Mine was that way when I got it..no charging system at all. Good point about pulling a battery cable while running. Thanks

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dan hill

06-10-2007 17:00:52

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Re: Polarization in reply to Tom N MS, 06-10-2007 15:57:55

I started working on cars in 1951 and never have had to do it.Friends and I started a Model A that had been idle for 10 years.My Dad looked at the ammeter and said shes charging.We used the A from 1951 till 1965 and never polarized it.I did a lot of generator and starter work from 1954 on an never had to polarize any thing.

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A. Bohemian

06-10-2007 17:34:40

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Playing the Odds, Eh? in reply to dan hill, 06-10-2007 17:00:52

When replacing a battery it is rarely if ever necessary to polarize. On the other hand, when replacing a voltage regulator, it is usually considered standard procedure.

There is no reason why one couldn't install many votage regulators without polarizing before encountering a problem. It's such a simple procedure, though, must of us take a few seconds and do it when installing a votage regulator and/or generator.

In any event, if you're paying attention to your dashboard ammeter, you'll know if you need to polarize or not.

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Bob

06-10-2007 18:38:15

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Re: Playing the Odds, Eh? in reply to A. Bohemian, 06-10-2007 17:34:40

The truth is, you are NOT polarizing the cutout/voltage regulator, you are polarizing the GENERATOR, specifically, rstoring the residual magnetic field in the field "polepieces".

If the generator WAS working before cutout or VR replacement, it will work AFTERWARD, NO polarizing required. The regulator has NOTHING WAHTEVER to do with the generator retaining residual magnetism in it's field polepieces.

Replacing a battery, ASSUMING the battery was connected properly before AND after the swap, has NO effect on the generator, and once again, polarizing is NOT needed. (Think about it... the cutout points are "open" at shutdown, so the generator is not even directly connected to the battery... the generator does not even "see" that the battery has been swapped.)

If there is a question about which polarity the generator was last charging, or the battery polarity HAS been "wrong", and has been corrected, you MUST polarize.

If the generator has not been run for a LONG time, has been removed, and banged around a bit or taken apart, polarizing is MANDATORY.

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Tom N MS

06-10-2007 18:52:27

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Re: Playing the Odds, Eh? in reply to Bob, 06-10-2007 18:38:15

Thanks, now I finally understand.I filed it away for future use since I know I won't be the last to ask this question..

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Tom N MS

06-10-2007 17:46:02

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Re: Playing the Odds, Eh? in reply to A. Bohemian, 06-10-2007 17:34:40

Ammeter hasn't worked for years. He disconnected it for some reason and I just never seem to have enough hours in the day to get around to checking on all the things I need to....But we did get his clutch kit in and it is working right and apparently it is working fine without polarizing. He has used it 8-10 hours since replacing the battery and has had no problem. Next time I'm there I plan to throw a meter across the battery post while it is running to see what it says. Across the battery with it running-6V generator, what should it read? Thanks

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Tom N MS

06-10-2007 17:32:37

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Re: Polarization in reply to dan hill, 06-10-2007 17:00:52

I just wondered. I'm not questioning anyone's knowledge but I guess I'd just like to know. And looks like you'd be able to tell somehow if for some reason it needed polarized this time but never has before--maybe by checking with a meter or something. Thanks

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