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A guy at the NW meet had charing problems when he arrived.O'Rielly's got the generator rebuit and charged the battery.The car started but it was still discharging and went dead??They said it was a short futher down the line and told him to contact the tech,he left a a message and received no return call..Could this be as simple as polarizing?He is out $300.and is hoping to get back to Portland
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If he took it off it has to be polarized to charge.
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I would think if the generator was removed and reintalled at the meet site it would have been polarized after inatallation ?if it was done by the O'reily's Tech who knows,posibly not?
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Why wonder if it was polarized or not?
Polarize it, charge the battery and see what it does!!
Are we sure we know that today's "techs" even know what the term "polarize" means?
ken48
VCCA 42589
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Your right about that Ken!Whats said is I was having lunch with this poor guy yesterday and he was telling us his said tail..I never thought to go back to the hotel and polarize it for him.Whats even mre disheartening is that the guys health is bad and his wife was doing all the driving and the trip from the meet back home is probably 150 miles,the car I think is an early 40's..I hope they got it fixed and made it safely
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I never heard of polarizing a generator! It was always the voltage regulator that needed polarized.
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You can polarize the generator (eletrical system) at the generator or on a later car at the voltage regulator....its all the same.
To be honest I seldom do it and have never had a problem.
Gene Schneider
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The Mangy Old Mutt
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Yes "as stated in the shop manual" The original question was...Will the generator charge if you rebuld it,reinstall and do not re-polarize?
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Maybe......maybe not. It all depends upon the circumstances. Some shops may have a generator test bench that has a positive ground system (mine does) so, in that case the generator would be polarized to a positive ground system. When the generator is installed on a negative ground system it won't charge unless the generator is repolarized.   
The Mangy Old Mutt
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You can polarize the generator (eletrical system) at the generator or on a later car at the voltage regulator....its all the same.
To be honest I seldom do it and have never had a problem. I usually forget to do it, and have never had any problems, either...Knock on wood...
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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The shop manual also says if not polarized it may burn the regulators contacts?
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The Mangy Old Mutt
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This being said Kevin find a BIG piece of wood to knock on..just kidding 
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I find a baseball bat a little handier...
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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I would say that it is best to follow the guidance in the maintenance manual. Last time I put on a generator, I had to polarize it. It may have been the fact that i hooked the generator to a battery to see if it would turn. Upon installation it showed discharge. The manual told me to ground one of the terminal wires (Batt or Field?) at the voltage regulator. Did so and it started charging. Charlie 
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Maybe......maybe not. It all depends upon the circumstances. Some shops may have a generator test bench that has a positive ground system (mine does) so, in that case the generator would be polarized to a positive ground system. When the generator is installed on a negative ground system it won't charge unless the generator is repolarized. That is good to know, however I am the only Pseudo-Tech my cars ever know and I don't own a test bench. I just follow the instructions in the shop manual and likewise I always polorize. It only takes a few seconds before starting the car up after messing with the generator. 
Life's a long winding trail, love Jesus and ride a good horse!
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The gen on my '30 engine was showing discharge a few weeks back after a rebuild and I polarized it as suggested here using a jump wire across cutout. Worked fine after that.
Interestingly, I loosened the drive belt during a timing exercise and did not tighten it fully before starting car again. On the road I notice ammeter indicating discharge. When I got home I checked belt and realized how loose it was and so re-tightened it. I then repolarized the gen and charging working fine since.
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Might not have to have re-polarized it, as the wiring had not been disconnected...Just tighten the belt...
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Oil Can Mechanic
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Might not have to have re-polarized it, as the wiring had not been disconnected...Just tighten the belt... My take on it is; it doesn't take long or hurt anything to polarize it, but the regulator could be damaged by not polarizing it if it needs it, so, if in doubt, polarize.
Richard
Waverly, IA
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Just do it!!!! 
ken48
VCCA 42589
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 To
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Wow...I'd better remember to re-polarize, the next time I change the belt or water pump...
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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