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Electrical Gurus......New One......

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John M

10-10-2007 16:44:34




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Whats a Self-Exciting alternator? Guy I work with says his M has one of these on it, got it from a local shop. Is he refering to a one - wire alternator. Just never heard the term.




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Gene S in IA

10-11-2007 14:42:12




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 Re: Electrical Gurus......New One...... in reply to John M, 10-10-2007 16:44:34  
I puy a one wire alt on my M but I couldn't rev it high enough to get it to cut in. I had to wire it like an unexcited one to make it work. I put one on my oliver 1850, only lasted 6 months, replaced it only lasted 5 months so I put unexcited one on it, so far 2 years and still going strong. I don't like one wire alts.
Gene



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Janicholson

10-11-2007 09:35:25




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 Re: Electrical Gurus......New One...... in reply to John M, 10-10-2007 16:44:34  
As pointed out badge engineering. Rename it and sell more! JimN



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Bob M

10-11-2007 06:57:52




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 Re: Electrical Gurus......New One...... in reply to John M, 10-10-2007 16:44:34  
John M - Usually a "self exciter" is a standard 3-wire 10SI alternator retrofitted with a different internal regulator to render it self-exciting.

As the others point out, most self exciters need to be spun up to a considerably higher RPM before they'll begin to charge. (However once they start charging they'll continue to charge atlow RPMs same as a 3 wire unit.) There are however "low cut-in" self-exciting units out there - but I've had no experience with them.

Also all self-exciters I've seen pull a small amount of current (on the order of milliamps) when shut down. Generally this leakage current is not a problem - it's usually less than a good battery's self discharge rate.

However I've run across a couple self-exciters that drew so much standby current they would flatten a fully-charged battery in a matter of a week or so.

I'm not particularly fond of self exciting alternators myself....

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John T

10-10-2007 17:03:13




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 Re: Electrical Gurus......New One...... in reply to John M, 10-10-2007 16:44:34  
The "self exciting" or so called "One Wire" is unlike say the 3 wire GM 10 SI (un exciting lol) in which we excite it via an external voltage source such as the circuit that feeds the ignition coil (so its hot ONLY when we switch on Ignition). Those self exciters can take a fairly high RPM before they kick in and on some models (Bob may know which) there may be a very tiny trickle discharge going on when they are setting there unattended for long periods.

John T

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old

10-10-2007 16:54:35




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 Re: Electrical Gurus......New One...... in reply to John M, 10-10-2007 16:44:34  
Yep its a one wire type alternator, just a different way to say the same thing.



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Bob

10-10-2007 16:54:05




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 Re: Electrical Gurus......New One...... in reply to John M, 10-10-2007 16:44:34  
Yup. Same "stuff", different name.



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