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Tractor Talk Discussion Forum

What is the cheapest 12v alternator out there.

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dej(JED)

06-08-2005 10:08:45




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I am working on a Farmall H and I am looking for the least expensive way to do a 12 volt conversion. Any ideas would be appreciated.




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THEkyroastnear

06-09-2005 18:26:48




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
you can get the gm. delco type for 25-30 dollars at auto zone ect. new .we usually get late 70s chevy- with some brackett modification it will fit just please dont cut out the hood -looks awful



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knauffj

06-09-2005 10:30:36




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
You could run over to Wagners on Rt 19, just north of Zeilienople (spelling??). They have a good sized truck and import car salvage yard. I bet you could find some of the mentioned alternators their. They've always sold me stuff at a reasonable price. I'd like to do the same thing to my Super M and AC WD45.



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David B

06-08-2005 18:41:17




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
We always use a GM alternator when we make Farmalls 12 volt. There's a guy about 45 minutes away from us that sells us everything we need and the alternator is freshly rebuilt, $45 I think.



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CJ3b_jeep

06-08-2005 12:43:43




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
I took the Delco SI alternator out of my "53 jeep to a <
br>good rebuilder and he lowered the cut-in speed on the self energizer, now it kicks in at about 800 rpm...cheap fix too



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RN

06-08-2005 12:07:06




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
Checkout salvage yards. For small size alternator that would fit under H hood -consider a Japanese model off a Honda or Nissan, (Hitachi or Nippodenso make). Nissan had alternator that looked and wired like a shrunken Delco S10. Honda Civics had small diameter also. RN



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Ryan

06-08-2005 11:52:52




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
Salvage yard is a cheap way to go. I give 15.00 for any they have or I go take them off myself. Give them a spin and check mounting flanges. If you get one that don't work regulators are cheap and easy to put in or upgrade to a self exciting regulator at that time.

Ryan



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NorminN.B.

06-08-2005 12:30:16




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 Re: What is the cheapest 12v alternator out there. in reply to Ryan, 06-08-2005 11:52:52  
With a self exciting regulater, does it still have to be reved up to make it start charging. My Cockshutt 540, has to be reved for quite awhile(2-3 minutes) before it starts to charge. Thanks, NorminN.B.



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Ryan

06-09-2005 07:59:51




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 Re: What is the cheapest 12v alternator out there. in reply to NorminN.B., 06-08-2005 12:30:16  
Yes that is the drawback, but you can run a wire maybe off your lights to give it a shot of juice. That way you just flip your lights on and it will start charging. Just a thought.

Ryan



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GregCo

06-08-2005 11:10:48




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
The Delco 10 SI out a salvage yard is pretty inexpensive.

Greg



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Mike (WA)

06-08-2005 12:07:15




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 Re: What is the cheapest 12v alternator out there. in reply to GregCo, 06-08-2005 11:10:48  
Other advantage of Delco 10 SI is that that is the one that most of the conversion instructions and documentation is written for. Other possibility is the "one wire" type, but that one needs to be "revved up" to excite it to begin producing juice, and besides being a pain to remember to do that, many old tractors won't rev up high enough to do the trick.



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wh

06-08-2005 10:48:43




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 If you are - - - in reply to dej(JED), 06-08-2005 10:08:45  
worried about the cost - WHY are you working an old tractor????? ???



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dej(JED)

06-09-2005 10:46:39




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 Re: If you are - - - in reply to wh, 06-08-2005 10:48:43  
WH---- Judging by the other responses, it seem that I am not the only one who watches cost. Thanks for your concern, but we aren't all millionaires like you. Why are you sluming it at this board anyway. With a mind like yours you should be in a govt. job.



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old

06-08-2005 10:23:30




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 Re: What is the cheapest 12v alternator out there. in reply to dej(JED), 06-08-2005 10:08:45  
That would probably be the delco alternator, but on an H you may have trouble getting it to fit under the hood. You can get them at a parts house for around $30-40



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Steve (Magnolia, TX)

06-08-2005 10:28:00




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 Re: What is the cheapest 12v alternator out there. in reply to old, 06-08-2005 10:23:30  
A buddy and I were looking online, just yesterday. I found several salvage yards (here in the Houston area) that were offering salvaged 32A delco alternators for as low as $14.95

HTH
Steve



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UncleTom

06-08-2005 16:02:09




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 CJ3b-Jeep in reply to Steve (Magnolia, TX), 06-08-2005 10:28:00  
You dont happen to know how he made it cut in at 800 rpm do you? I would like to learn that. I can fix atenators but not sure how you would do that modification. UncleTom



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Jon H

06-08-2005 17:20:30




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 Re: CJ3b-Jeep in reply to UncleTom, 06-08-2005 16:02:09  
I have found that not all "one wire" regulators are the same,some excite at lower rpm than others.
Also on the many "one wire" regulator conversions I have done with Delco 10SI alternators, I have found that the small amperage models(37 amp)excite at much lower rpm than the larger 55-61 or 72 amp models. The small 37 amp "one wire" Delco 10SI is more than up to the job of keeping the battery charged on the average old tractor. To convert one of the larger amperage 10SI alternators to 37 amp or lower,all you need to replace is the stator which is cheap and easy to replace. I have seen as much as 1000 engine rpm difference needed to excite a "one wire" Delco comparing a 37 amp to a 72 amp.

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Bob

06-08-2005 16:36:09




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 Re: CJ3b-Jeep in reply to UncleTom, 06-08-2005 16:02:09  
Connect the alternator's #1 "excite" terminal to the ignition switch with a simple "idiot light" or 3 Amp 1000 PIV diode in the lead. (If you have magneto ignition, you can use an oil pressure switch that cuts in at about 4 PSI to engergize the "excite" circuit.)

Jumper the #2 "sense" terminal to the large output stud.

The diode can be had surplus for a few cents, or not over a buck or two at an electronics supply.

Then you can use a salvage yard 10SI alternator with NO NEED for the special "one wire" internal conversion, AND it will charge at low RPM's just as it is!

Cost {around here) of a good working salvage 10SI alternator... $10.00 to $25.00, plus cost (max) of diode $2.50... Is $11.00 to $27.50 cheap engough for you?

Try buying a voltage regulator for your old generator or replacing the old generator for that kind of money!

The link below is to Bo Melville's diagrams... a wonderfull resource!

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