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Tractor Talk Discussion Forum

Autolite Voltage Regulator

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Richard Fazio

12-31-2003 15:39:44




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I have a Farmall tractor that was converted to 12 volts and is using an autolite alternator. The voltage regulator is dead. I got a new one but before I hook it up I want to be sure I'm connecting the wires to the correct terminals. It's very possible the previous owner played with it and that's why it was fried. The old voltage regulator and the new are marked F-2-3-4. Can anyone tell me which terminals are what? Field, Stator, Batt and ground? Thanks

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Mike (WA)

01-01-2004 08:18:30




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 Re: Autolite Voltage Regulator in reply to Richard Fazio, 12-31-2003 15:39:44  
Great stuff, Jon- Also, its sometimes helpful when you have an alternator from unknown source on a tractor, to look at Motor auto repair manuals, which list auto applications by part number- once you find your alternator's original application, you can then get the part number for the proper regulator, etc. so at least you can have a "system" rather than mixed parts. Then just remember to get parts for a '74 Dodge rather than a Farmall Super M :>)

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Jon H

12-31-2003 17:37:42




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 Re: Autolite Voltage Regulator in reply to Richard Fazio, 12-31-2003 15:39:44  
Your description tells me that the fellow that did the alternator conversion on your Farmall used a regulator designed for the Delco external regulator alternator(Terminals marked F-2-3-4),as an Autolite regulator whould have terminals marked (I-A+-S-F). No problem, the specs are close enough that a Delco regulator will do a good job controlling that Autolite alternator. 1 just hook the regulator #3 terminal to switched 12 volt power. 2 hook the regulator F terminal to the FLD stud on the alternator.
3 Run a ground wire from the ground stud on the alternator to one of the mounting bolts on the regulator. If the FLD wire is shorted to ground anywhere between the regulator amd alternator,it will instantly destroy the regulator. Using a salvage yard regulator plug at the regulator will help prevent shorting the F terminal at the regulator. Also before installing your new regulator,you should check your alternators FLD/rotor terminal for excessive current drain. The rotor can be partially shorted which will burn out the new regulator. A small 12 volt battery charger((6-10 amp) works well. Remove the FLD wire from it's alternator stud and connect the chargers pos clip to the FLD stud.Connect the chargers NEG clip to the alternator case. The chargers guage should read between 2-4 amps max. If it alternator passes this test,you should be OK to install the new regulator.

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Richard Fazio

12-31-2003 20:11:06




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 Re: Re: Autolite Voltage Regulator in reply to Jon H, 12-31-2003 17:37:42  
Ah so that's why the confusion. I've got a delco regulator and an autolight alternator. I understand what your telling me, but have one question. There are four terminals on the regulator. One I believe is the idiot light, so that can be left off. What's the other? And what should go on the stator of the alternator?



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Jon H

12-31-2003 20:43:41




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 Re: Re: Re: Autolite Voltage Regulator in reply to Richard Fazio, 12-31-2003 20:11:06  
On an amp guage system like your tractor the wiring is very simple, only the #3and F terminal are used on the regulator,#2 and#4 are not used in this application. The sta(stator)stud terminal on the alternator is only used on an idiot light system,so nothing is connected to it on an amp guage system.



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Richard Fazio

01-01-2004 06:27:39




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 Re: Re: Re: Re: Autolite Voltage Regulator in reply to Jon H, 12-31-2003 20:43:41  
Jon, thank you very much for the info.



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Alberta Mike

12-31-2003 17:09:12




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 Re: Autolite Voltage Regulator in reply to Richard Fazio, 12-31-2003 15:39:44  
Are you sure that your alternator needs an external (or separate) regulator?



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No. Ala.

12-31-2003 19:47:07




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 Re: Re: Autolite Voltage Regulator in reply to Alberta Mike, 12-31-2003 17:09:12  
Thats something that I wondered about also Mike.



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Alvin n Ms.

12-31-2003 21:37:24




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 Re: Re: Re: Autolite Voltage Regulator in reply to No. Ala., 12-31-2003 19:47:07  
For as I know Delco Reamy is the only one with an internal regulator. alvinnms



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Rlach

01-01-2004 14:07:20




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 Re: Re: Re: Re: Autolite Voltage Regulator in reply to Alvin n Ms., 12-31-2003 21:37:24  
Motorola uses integral regulator also.
Rlach



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Alberta Mike

01-01-2004 06:51:30




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 Re: Re: Re: Re: Autolite Voltage Regulator in reply to Alvin n Ms., 12-31-2003 21:37:24  
But would an external regulator with an alternator have all those connection tabs on it? Never had much experience with alternators converted for tractor use myself. Sounds like maybe the old regulator from the generator was left on when the alternator conversion was made maybe?



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Jon H

01-01-2004 08:13:18




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 Re: Re: Re: Re: Re: Autolite Voltage Regulator in reply to Alberta Mike, 01-01-2004 06:51:30  
Yes Mike, with a alternator light system,the Delco regulator needs 3 of 4 terminals connected and the Autolite/Motorcraft uses all 4. In both systems the slight current draw of the alternator light excites the alternator enough to get it to put out a small charge which energizes a field relay in the regulator which then fully energizes the alternator and puts the charge light out. It gets more complicated with the indicator light system.

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