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Tractor Talk Discussion Forum

alternator

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hay

02-24-2007 05:42:14




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the one wire alternator on my ford tractor is not charging. is there any way to diagnose what could be causing this? all i have is a small volt-ohm meter. are parts avaliable for alternators? i am trying to cut costs as the cheapest rebuilt one wire alternator i found is $72 plus core charge. even the few wrecking yards left around here don't have them.




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Bob

02-24-2007 06:47:42




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 Re: alternator in reply to hay, 02-24-2007 05:42:14  
Ditch the (goofy) one- wire alternator, and get a REAL 3-wire alternator, such as one from a 1975 to 1985 Chevy pickup. The "boneyards" will have them for as litle as $10.00.
Run one extra wire to the alternator's #1 "switched excite" terminal, with a diode (as shown), or an idiot light with a #194 bulb (or equivalent) to prevent the backfeed of current OUT of the alternator's #1 terminal, and you're done.



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Jon Hagen

02-24-2007 07:24:07




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 Re: alternator in reply to Bob, 02-24-2007 06:47:42  
Hay, is your 1 wire alternator an internal regulator Delco like the one in Bob's picture?
If it is, then it may only need a"field flash".
That is to use a piece of insulated wire to jump from the big "BAT" stud on the alternator rear, to the #1 regulator blade terminal. If your 1 wire alternator has simply lost it's residual magnetism, jumpering this connection for an instant with the alternator running at near full speed will restore the residual magnetism and the alternator will work again. The beauty of the 1 wire Delco alternator conversions is that the ONLY difference between the 1 wire alt and a standard 3 wire is that the 1 wire is equipped with a very sensative regulator that will excite without external voltage being applied. Plus this regulator "senses" system voltage internally, so that the external #2 regulator sense wire is not needed. There is no difference in price between the 1 wire regulator and the std 3 wire ones supplied to me by a jobber.
There is absolutly no difference in components, cost or battery drain between a std 3 wire Delco and a 1 wire Delco conversion besides the "special" 1 wire regulator. A 1 wire Delco conversion alternator gives you the opertunity to convert from a generator to an alternator without adding any wiring,resistors,diodes,lights,etc with the option of adding a $2 replacement Delco alternator plug from your auto parts store plus the Diode or resistor/indicator light if you want a charge indicator light or want to lower "kick in" speed. The 1 wire will work as a three wire unit, the 3 wire will not work as a 1 wire.

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