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Harry Ferguson Tractors Discussion Forum
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12 volt conversion charging problem

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dfitch

03-14-2006 04:18:50




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Want to try to clarify what is needed to get a Delco Alternator to charge after converting to 12 volts. The attached picture is the internal regulator of a Delco Alternator. The 2 tabs on the regulator are the P1 and P2 terminals on the back of the alternator and its easy to see that if you do not have P1 and P2 wired you are not using the internal regulator and must use "other" means to get it to charge. P2 should be strapped to the Bat terminal of the Alternator
and P1 should be wired to the coil side of the ignition switch through a 1Amp/50 Volt diode

http://www.tractorshed.com/gallery/pieces/v3479.jpg

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Allan in ID

03-28-2006 06:19:30




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 Re: 12 volt conversion charging problem in reply to dfitch, 03-14-2006 04:18:50  
Great info guys, thank you.



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Jim in OH

03-14-2006 07:47:29




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 Re: 12 volt conversion charging problem in reply to dfitch, 03-14-2006 04:18:50  
The problem is that these alternators are sold as "one-wire" conversions where you only run one wire (from the battery) to the alternator without explaining the limitations and requirements to make it work. Here is a good site that discusses using the Delco as a "one-wire" alternator. Note that when wired with P2 and BAT combined and nothing attached to P1 (i.e., in the "one-wire" mode), it will be necessary to spin the alternator to about 3000 rpm before it will self-excite. To make this work on our low reving Fergusons, you will need to change the regulator to a self exciting type (which most suppliers do not do) or use a smaller pulley on the alternator. The best way, in my mind, is to NOT use it as a "one-wire", and connect the ignition to P1 (with a diode in series). This will assure that it charges at lower rpm as well. JIm

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dfitch

03-14-2006 04:28:10




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 Re: 12 volt conversion charging problem in reply to dfitch, 03-14-2006 04:18:50  
third party image

Didn't correctly attach picture the first time hope it works this time



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