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one wire alternator

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09-23-2003 14:57:20

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I have a one wire alternator that requires the motor to race before the field is excited. Does anybody know of a modification that can be made to it so it will start charging at a lower RPM?

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Lee

09-24-2003 14:05:26

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Re: one wire alternator in reply to pj, 09-23-2003 14:57:20

My Jubilee has the same setup. I just let the engine warm up a bit then once I'm under way I give it enough gas to get it started charging. I don't like to rev a cold engine either so I don't. I guess that sounds way too simple but it works just fine.
Good Luck, Lee

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Jim Cox

09-24-2003 09:43:42

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Re: one wire alternator in reply to pj, 09-23-2003 14:57:20

if you want a lower turn-on speed, have a professional put in a new stator, usually a 'WYE' wound, with more loops/revoloution, and generally a lower current output (the more loops, the more space it requires, and a smaller wire to fit). The increased turns will excite the trio circuit at a lower RPM. Jim Cox
Product Engineering
Case/New Holland Reman Electrical

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Jack B.

09-24-2003 05:32:29

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Re: one wire alternator in reply to pj, 09-23-2003 14:57:20

The one-wire generator charges at low rpm IF the relay is operated! On my 41 9N the relay cover can be eased off by carefully straightening a tab, and if you know how to adjust a relay (I worked for the phone company years ago) it's not difficult, but there is a downside.

If the relay does not open when you shut the engine off, the battery will drain to ground through the relay contacts. All that current may burn the contacts, too.

This is only a guess, but you might be able to tweak yours a mite and get it to pull up sooner. That's what I did with mine and it's worked fine for a number of years.

I also ended up installing a dash voltmeter across my 6 volt battery after I fried one.

Good luck.

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uh . . . Dell (WA)

09-24-2003 07:05:26

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Re: Re: one wire alternator in reply to Jack B., 09-24-2003 05:32:29

Jack..... ...what you say is true for the 6 volt 1-wire generator and the roundcan cut-out relay on the steering column.

HOWSOMEVERS..... different problem with the commonly used 12 volt Delco 10-SI ALTERNATOR. Its got built-in solid state voltage regulator (and cut-out diode).

There are 2 versions of the Delco alternator, one a deceptively desireable 1-wire version that relies on retained magnitizem and 1800 rpms to start charging. I don't like jazzin' a cold tractor engine that high, automobile engine different story 'cuz you generally haffta get to 2500-3000 rpms before you start moving.

Remember, N-Engine specs: 400 rpms idle, 2200 MAX rpms.

I much prefer the Delco 10-SI 3-wire version which starts charging at about 500 rpms, just like GM designed it. Besides you get to install an idiot light..... ....Dell

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NoahW

09-23-2003 22:04:23

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Re: one wire alternator in reply to pj, 09-23-2003 14:57:20

Not real sure, but I think to get the alternator to turn faster at a given rpm, you need a smaller pulley on the alternator. Think of the circumference of two pulleys as straight lines. If they are the same size pulleys the lines will be equal in length. If one is larger than the other, the cicumference is larger therefore the straight line is longer. If pulley #1(crank) is larger than #2(alternator), #2 will turn faster because the lines have to equal at the end of one crank rpm. If the circumference of #1 is 24", a given point on the pulley will travel 24" in one revolution. If the circumference of #2 is 12", it will have to make 2rpms to every one of pulley #1. 2(12)=24, so to increase the speed of the alternator, decrease the size of the pulley on the alternator(shorter lines). Let's decrease the size of #2 to 8". #1 still travels 24", so to keep things equal, the speed of #2 will increase to 3rpms. 3(8)=24. Long winded, but I tried to keep it simple for the new guys on the block. If it ain't right sombody let me know.

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RAT IN NB

09-23-2003 21:09:02

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Re: one wire alternator in reply to pj, 09-23-2003 14:57:20

pj here is something you can try put a bigger pulley on the alternator it will then spin faster and charge quicker but it only takes 700 rpm to get the GM one wire to charge as it is I have one on mine and it just takes a little rev and I'm off and charging. mtcw

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09-23-2003 17:32:33

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Re: one wire alternator in reply to pj, 09-23-2003 14:57:20

I have a one wire Delco alternator. There are two connection points on top of the alternator. One is marked #1 and the other one #2. I ran a wire from #1 to a push button horn switch and then ran a wire from the horn button to the hot side of the block on the dash. After starting the tractor you push the horn button and the alternator starts charging immediately. This eliminates revving the engine. My tractor had a one wire alternator installed, when I purchased the tractor.

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