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polerizing question

B

bawplank

New User
When is polarizing needed. I rebuilt my starter so the battery was unhooked do I need to repolarize? I havent started it because im rebuiding the carb and doing brakes just wondering for when im ready to try it out. thanks
 
no, only neededfor A new Genny, or a complete rebuild of a genny. If alternator, it is never done. JimN
 
Not arguing, Jim, but I'd always understood that a generator would only hold its polarity as long as it was hooked to the same hot and ground as the battery, and that if that polarity was lost with that connection. If that's not the case, I'm perfectly (and humbly) willing to report that I learned something today.
 
The hot wire to the generator is disconnected each time the contacts open in the regulator.

Polarizing a generator results in magnetizing the pole shoes. The residual magnetism in the pole shoes create the magnetic lines of force necessary for the generator to start charging. As long as so magnetism remains in the pole shoes the generator should be able to start charging. Which way they were magnetized will determine whether it will charge with positive ground or negative ground. Polarizing each time a battery is installed is a good way to insure that if the battery is installed backwards the regulator will not be fried.
 
Scotty,

HOW would you explain the battery keeping the generator polarized while they are totally disconnected from each other at shutdown, when the cutout points open??? (Discrete cutout, or cutout in the VR.)

How does the generator "know" the battery has been disconnected when it's not even CONNECTED to the battery after shutdown???

As long as the tractor has not sat unused for YEARS, or the generator has been severely knocked around or disassembled, the generator WILL charge the same polarity at startup as it did the last time it was run, no matter HOW MANY times the battery has been disconnected/connected.

My GOSH this has to be be the biggest old mechanic's wives' tale that's ever been perpetrated!
 
(quoted from post at 23:46:59 01/04/09) Scotty,

HOW would you explain the battery keeping the generator polarized while they are totally disconnected from each other at shutdown, when the cutout points open??? (Discrete cutout, or cutout in the VR.)

How does the generator "know" the battery has been disconnected when it's not even CONNECTED to the battery after shutdown???

As long as the tractor has not sat unused for YEARS, or the generator has been severely knocked around or disassembled, the generator WILL charge the same polarity at startup as it did the last time it was run, no matter HOW MANY times the battery has been disconnected/connected.

My GOSH this has to be be the biggest old mechanic's wives' tale that's ever been perpetrated!
Click to expand...
Yep. And it sits right next to "setting your battery on the earth or concrete will suck the juice out of it". :(
 
Bob below is correct. I would just say it always gets disconnected every time the VR cutout opens. Thus it is just like an old iron bar that retains some magnetism. just no reason not to keep its magnetism. JimN
 
It's the LAW! (Or at least a RULE!)

Check out the link below and scroll down to "Right Hand Current Rule".
RIGHT
 
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