1 Wire Alternator Pulley

JW Axtell · Mar 21, 2009

In order to not have to race up the motor to excite a 12 volt 1 wire alternator couldn't I increase the size of the pulley? And if so what size would be adequate?
Thanks all

Dell (WA) · Mar 21, 2009

Axtell.......nope, big pulley slows 'er down, little pulley speeds 'er up ...but... 5/8" belt can't go around too small of a pulley. Its the LAW, called circumference. Belt speed is controlled by engine speed that is WHY you haffta goose yer cold engine to start the deceptively desirable 1-wire alternator to start charging. Once it starts charging it will charge at 600rpms. Its the internal guttz of the alternator. ......Dell

Ford 312 · Mar 21, 2009

To make the alternator turn faster you would need a smaller alternator pulley instead of a larger pulley. I purchased an 8N with a one wire alternator. I found that you can wire them the same as if they were a three wire alternator and they will charge without having to have a lot of rpms on the engine.

JW Axtell · Mar 21, 2009

(quoted from post at 15:12:42 03/21/09) Axtell.......nope, big pulley slows 'er down, little pulley speeds 'er up ...but... 5/8" belt can't go around too small of a pulley. Its the LAW, called circumference. Belt speed is controlled by engine speed that is WHY you haffta goose yer cold engine to start the deceptively desirable 1-wire alternator to start charging. Once it starts charging it will charge at 600rpms. Its the internal guttz of the alternator. ......Dell

Another senior moment. I actually meant smaller pulley Guess it's time for something stronger than this beer. Now that we are on the same wave length how much smaller? I have a few 2.5 inch pulleys kicking around my bench. Think they would help?

JW Axtell · Mar 21, 2009

(quoted from post at 15:14:54 03/21/09) To make the alternator turn faster you would need a smaller alternator pulley instead of a larger pulley. I purchased an 8N with a one wire alternator. I found that you can wire them the same as if they were a three wire alternator and they will charge without having to have a lot of rpms on the engine.

You wouldn't happen to have a diagram of this( 1 wire to 3 wire) would you?

8N-Randy · Mar 21, 2009

I bought a 12v kit off ebay with a one wire alterator. It had a small pull included. I find I don't have to "goose" the throtle to start charging. It strats charging just fine at low rpm

Ford 312 · Mar 21, 2009

I tried to find a picture of the three wire conversion in the archives but was unsuccessful. However here are written instructions from the archives.

The “Bat” terminal should be connected to the ammeter with a 10 gauge wire. If a voltmeter is used instead of an ammeter, the 10 gauge wire can be run directly to the stud on the starter where the battery cable connects.
The number “1” terminal should be connected to the ignition switch with 16 or 18 gauge wire so the alternator only receives power when the tractor is “on”. A one amp / 50 volt diode should be installed between the ignition switch and the “1” terminal to prevent backward current flow through the alternator when the ignition switch is “off”.
The number “2” terminal should be connected directly to the “Bat” terminal (16 or 18 gauge wire) on the back of the alternator.

Hopefully someone will jump in here with a picture of the three wire alternator hook-up.
HTH

JMOR · Mar 21, 2009

Diode or idiot light optional should be read to mean you choose one or the other.

1 Wire Alternator Pulley

JW Axtell

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Dell (WA)

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Ford 312

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JW Axtell

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JW Axtell

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8N-Randy

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Ford 312

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JMOR

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