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12 volt 641 Cont'd

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AJ

02-11-2001 16:07:21




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I did some more checking. The battery was hooked up negative ground. The voltage regulator is marked 12 volt positive ground. It still has a 6 volt coil getting 12 volts. Should I reinstall the battery with the positive to ground and repolarize the 12 volt generator? Is the voltage regulator still O.K. after being connected with a negative ground? I'll get a resistor to knock the voltage down to the coil. Or should I just get a 12 volt coil. Thanks for the help. AJ

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Bill (in Colo)

02-13-2001 23:47:34




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 Re: 12 volt 641 Cont'd in reply to AJ, 02-11-2001 16:07:21  
In regards to the coil...

I'm baffled why folks bother with the 6vCoil + resistor.

12v Coils are cheap (almost free at wrecking yards), and eliminating the dongle-ee external resistor enhances durability of the system.

There are also 12v coils with built-in ballast resistors to protect against "closed-points- supplying-unending-current-to-nonRotating- engine-with-ignition-on", reduces the 12v power that must be dissapated by the coil in that case.

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Al English

02-11-2001 17:57:32




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 Re: 12 volt 641 Cont'd in reply to AJ, 02-11-2001 16:07:21  
Hi AJ, The purpose of polarizing a generator is to magnetize the field shoes, allowing the generator to produce enough output to get it going. Polarizing your generator will not change it from a posative ground to a negative ground unit or visa versa. The relationship between the fields and armature, and the armature and brushes, determines the polarity of the generator. Maybe you have a posative ground generator from a Brittish car, early ford, or some other posative ground installation? I would figure out what you have then go from there. Here's a crude way to determine the polatity of your generator. With the battery correctly installed remove the belt, manually close the cut-out relay contact on your regulator, observe which way the generator rotates. If it is correct it will rotate in the opposite direction it is driven by the belt. Hope this helps...Al English

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AJ

02-12-2001 05:36:53




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 Re: Re: 12 volt 641 Cont'd in reply to Al English, 02-11-2001 17:57:32  
Al English Which is the cut-out coil on the voltage regulator? Or which terminals on the generator would I connect to a battery? The battery is out of the tractor now as are the cables waiting for replacement. Thanks AJ



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Al English

02-12-2001 06:05:33




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 Re: Re: Re: 12 volt 641 Cont'd in reply to AJ, 02-12-2001 05:36:53  
Hi AJ, The cutout relay coil will be wound with small gauge wire. If you close the "wrong" one nothing will happen, and no damage will be done. A note on the generator spinning like a motor. It should spin at a decent speed, at least as fast as it turns at idle. I say this because I vaguely remember a generator that would turn very slowly when the polarity was reversed. This doesn't make sense and I could be wrong, but I don't think so. Sorry I don't remember more about it. Probably too many years of paint fumes and exhaust...Al English

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