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The Mangy Old Mutt
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You forgot in mention when you disconnect the battery or change the oil.... 
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Shade Tree Mechanic
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Hi Guys sorry to interrupt, but how do you polarize a generator? I have a '27 Capitol, but haven't read anywhere about how to polarize!! I know mine could probably use it!! Thanks
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MickyC,
Briefly touch a wire from the positive battery post to the output wire of the generator. In your case just jump around the cutout. Or disconnect the wire from the battery on the cutout and touch it to the wire coming out of the generator or that terminal on the cutout that the output wire screws onto.
How Sweet the roar of a Chevy four!
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Shade Tree Mechanic
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Hi there, I have read with interest every post regarding "POLARIZING" a generator, yes every post, but not one mention of what "POLARIZING" is? or how to do it? and of course why it is needed? can some learned gentleman on here explain my questions for all the other novice like myself?  BTW, is it needed if you drive at the north or south pole?  regards Peter
never give 100% unless you are giving blood.
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Tech Advisor ChatMaster - 25,000
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There have been numerous posts here in the past on the procedure for polarizing a generator, both with a cut-out and with a voltage regulator. You might want to do a search on Chevy Chatter for the previous posts describing how to polarize a generator. For additional information go to this web site: http://web.utk.edu/~tprather/FoothillsTractorClub/TechTips/PolarizeGenerator.html  
The Mangy Old Mutt
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Go back and read the previous page. I don't have the answer for all your questions, however polarizing I believe refers to the magnetic field and setting the direction in which the current will flow. Direct current flows from positive to negative so if the input of the generator is positive there will be no current output. Think of it as magnets where one side attracts and the other repels. Polarizing the generator changes the magnetic direction of the fields. If I have messed up what I have posted I am sure it will get corrected.
Steve D
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Grease Monkey
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Grease Monkey
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The generator voltage is induced in the generator armature rotating in the magnetic field from the poles fixed inside the generator casing. The poles are magnetised (excited) from the generator itself when generator voltage causes current to flow in the pole (field) windings. At standstill the generator voltage, of course, is zero. The generator voltage build-up after starting the engine is initiated by the small remaining magnetism in the poles from last time the generator was running. Normally this remanence will always be present, but it can be lost if the generator has been disassembled or the vehicle has been out of use for a long period. (Or if voltage of opposite polarity have been applied, poles have been interchanged, etc.) If remanence magnetism is lost, voltage will not build up when armature rotates. Cure is, as explained in previous postings, to apply current from the battery to the generator by bypassing the cut-out relay with a piece of wire for a short moment. If this does not work, check wiring and field winding continuity.
Polarizing is to reestablish the remanence (residual magnetism) of the generator poles.
A fairly good description is given in Chevrolet Repair Manual for the International and Universal Models, a 272 pages booklet available in reprint copies.
Good luck,
Einar
Last edited by Einar; 11/17/13 07:51 PM.
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hi there Einar, thank you for posting your clear reply, I now understand the meaning and what to do if needed, thank you very much from down under....  Peter 
never give 100% unless you are giving blood.
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MickyC,
Briefly touch a wire from the positive battery post to the output wire of the generator. In your case just jump around the cutout. Or disconnect the wire from the battery on the cutout and touch it to the wire coming out of the generator or that terminal on the cutout that the output wire screws onto. Hi there, I now have to polarize my generator. Do I do it with the ignition ON or OFF.? Peter
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The Mangy Old Mutt
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I think that I would have said
OFF!!!
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The Mangy Old Mutt
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Really...?
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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And, you need to polarize too when you change a tire or turn your radio on and off. Really... It's raining here in California and I got nothing better to do... Sorry
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
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thanks for the advice, BUT, are you absolutely sure about that, I mean really , truly , absolutely sure that it has to be OFF? as in standing on your head Sure? its not raining in New South Wales today either.....  Peter
never give 100% unless you are giving blood.
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OFF!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The Mangy Old Mutt
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Shade Tree Mechanic
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Great topic. I really learned something. My thanks to all.
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The Mangy Old Mutt
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Great topic. I really learned something. My thanks to all. Glad you did too, but do you think we went OFF subject a wee bit?
never give 100% unless you are giving blood.
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The Mangy Old Mutt
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