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Farmall & IHC Tractors Discussion Forum
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Bob Melville ---- I need your HELP!!!!!!!!!!!!!!!

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Farmall Freddy

01-09-2004 07:09:48




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Would you please review for me the different ways to excite a three wire Alternator. I am changing a Cub over to a 12 volt system and I have a three wire small aternator that will fit under the hood that I would like to use. Will the low RPM's that the Cub runs at be a problem?

THANK YOU




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Bob M

01-09-2004 07:57:07




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 Re: Bob Melville ---- I need your HELP!!!!!!!!!!! in reply to Farmall Freddy, 01-09-2004 07:09:48  
A couple suggestions:

1 - Install the smallest pulley you can find on the alternator. There's no danger of overspeeding it on a Cub, and the smaller pulley will spin the alternator fast enough at low speed for it to begin to charge.

2 - Recommend staying away from self-exciting (so-called "single wire") alternators. They are more expensive, and you may have trouble spinning it fast enough on startup to get it to begin to charge. 2 and 3 wire setups turn on at a much lower RPM than will the single wire units.

Punch below for wiring diagrams for 1 and 3 wire Delco alternators. Note: If your alternator is not a Delco 10SI, the wiring may be different!

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Farmall Freddy

01-09-2004 09:36:15




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 Re: Re: Bob Melville ---- I need your HELP!!!!!!! in reply to Bob M, 01-09-2004 07:57:07  
Bob, is it possible to use a relay in place of the warning light. I don't like having to always answer the question "What is that light for".

Thanks



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Bob M

01-09-2004 10:25:06




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 Re: Re: Re: Bob Melville ---- I need your HELP!!! in reply to Farmall Freddy, 01-09-2004 09:36:15  
Yes - you can use a relay in place of the light. However it's one more thing to buy, install, to go wrong, etc.

You can also substitute a suitable diode or resistor for the warning light. Or you can do as I've done and mount the lamp holder hidden someplace up under the hood.



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Jim

01-09-2004 11:32:31




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 Re: Re: Re: Re: Bob Melville ---- I need your HEL in reply to Bob M, 01-09-2004 10:25:06  
Is there an electrical purpose to the light beyond being a warning light? I dont understand if you mount it where you cant see it.....



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Bob M

01-09-2004 12:07:30




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 Re: Re: Re: Re: Re: Bob Melville ---- I need your in reply to Jim , 01-09-2004 11:32:31  
Jim - Yes, there is an electrical purpose for the warning lamp. Without the lamp (or an equivalent resistance) the alternator will not begin to develop output. The small current passing through the lamp provides the initial "flash" current to magnetize the field winding at startup. After the alternator's output builds up field current is tapped from the output and the light goes out.

And from my perspective the lamp provides a convenient warning should the alternator fail or the drive belt break - useful when non-gage watching operators (which includes about everyone but myself) run my tractors…

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Jim

01-09-2004 12:26:59




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 Re: Re: Re: Re: Re: Re: Bob Melville ---- I need in reply to Bob M, 01-09-2004 12:07:30  
great..now I know what to put in the cigarette lighter hole in the dash...



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Fred - Kansas OOPS!

01-09-2004 08:38:25




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 Re: Re: Bob Melville ---- I need your HELP!!!!!!! in reply to Bob M, 01-09-2004 07:57:07  
Bob,

Didn't mean to barge in on the question addressed to you. Just didn't catch the fact that someone had addressed the question to you until I hit the send button.

From now on I will have my coffee before I start looking over the discussion board.

My humble apologies,
Fred - Kansas



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Fred - Kansas

01-09-2004 07:35:02




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 Re: Bob Melville ---- I need your HELP!!!!!!!!!!! in reply to Farmall Freddy, 01-09-2004 07:09:48  
Bob,

One of the benefits of an alternator is that they start producing current at a lower RPM than a generator will. As far as I know, alternators have a self-exciter built into them and do not need to be manually excited.

Luckily for me there is a company in town that manufactures 6 volt alterators and I have bought one for my H, which fits right under the hood.

The company does a lot of business with the folks at the Hollywood movie studios where they use a lot of vintage automobiles that are not run enough at speed to keep the batteries up with generators.

Several of the farmers in the area have put the 6 volt alternators on their older equipment, which do more idling than they do running at a higher RPM.

Nothing wrong with a generator if you're plowing all day, but for short runs and lots of lower RPM activity, the alternator is the way to go.

Fred - Kansas

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SGT K

01-09-2004 07:51:41




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 Re: Re: Bob Melville ---- I need your HELP!!!!!!! in reply to Fred - Kansas, 01-09-2004 07:35:02  
Fred,
What's the name and number of this place?



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Fred - Kansas

01-09-2004 08:14:24




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 Re: Re: Re: Bob Melville ---- I need your HELP!!! in reply to SGT K, 01-09-2004 07:51:41  
Their name is Fifth Avenue Antique Auto Parts and their number is 785 632 3450.

I just did an Internet search on their name and there are a couple of articles about them listed there that you can read.

Good luck,
Fred - Kansas



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