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Old 08-13-2020, 10:07 PM
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fyrffytr1 fyrffytr1 is offline
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Default How to polarize a generator?

While reading up on my 39 Pontiac I saw several sites that said the generator needs to be polarized if it has sat for a long time. Well, mine sat for 50 years so how do you polarize one?

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  #2  
Old 08-13-2020, 10:33 PM
Schurkey Schurkey is offline
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The way I remember--from reading, not from doing--is to jump a couple of terminals on the voltage regulator. You're basically using battery current (electromagnet) to re-magnetize the iron of the generator. It has to have some residual magnetism to begin charging. Once it starts to charge, it self-magnetizes the generator. Leave the generator long enough, and there's no residual magnetism, and it won't begin charging.

I'll have to look that up in the Delco 1.2 manual.

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Old 08-13-2020, 10:46 PM
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Stuart Stuart is offline
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Is the generator charging the battery at all? If the ammeter on the dash is anywhere on the positive side when the engine is running, and/or if voltage at the battery is greater than 6.5 volts or so (assuming it's still a 6 volt system) the generator is polarized already and you don't need to do anything.

If the ammeter shows a discharge instead when the engine is running, then it may need to be polarized. With the engine off, use a jumper wire to momentarily touch between the BAT terminal and the GEN or ARM material. You should see a little spark. That's all you have to do.

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Old 08-14-2020, 12:10 AM
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Jim Moshier Jim Moshier is offline
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When I replaced the voltage regulator the easiest way is to turn the headlights on to polarize the voltage.

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Old 08-14-2020, 01:58 AM
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Bill Hanlon Bill Hanlon is offline
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Look in the right hand column
http://chevy.oldcarmanualproject.com...5559mm334.html

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