12v Conversion AGAIN....

Dachshund · Nov 11, 2017

Okay, probably been covered before, but I can't find it! SO here goes....
I have heard from several people that they use a "1 wire Delco Alternator". I have also heard several people say not to, they use a "3 wire Nippon-Denso (or other) alternator". So, which would be the best for fitment and reliability. I am GOING to do this conversion, so don't try to talk me out of it! LOL!

I know the Denso unit is very small compared to the Delco.
What size pulley on either is used?

Thanks!

Dachshund · Nov 11, 2017

This is on a Farmall H, BTW.....

Janicholson · Nov 11, 2017

I promote the standard 3 wire on this forum. It is simple and the way the alternator and internal regulator were intended to operate. The three wire system is really just 2 wires to hook up any distance as the #2 spade terminal (S on a Hitachi, which is really a best fit on an H) connects to the output lug 5 inches away. A simple side marker or instrument light bulb (not led) spliced into the wire keeps it from continuing to run when shut off. (it is the idiot light in a Chevy) or Nissan). The autozone alternators are now able to be used either way. With an indicator, or without. Same price. Jim

pinball · Nov 11, 2017

From what I understand it costs more to rebuild a one wire alternator. I use the 3 wire because my supplier only has those. I have used both. Guess its just ones preference.

tractorguy2 · Nov 11, 2017

I have used Deloc three wires on Farmall H tractors. They fit well.

If your H has a magneto. A three wire will be more difficult to wire.

DeltaRed · Nov 11, 2017

I use the Delco 'one wire' alternator. I have 5 tractors set up that way.I completely strip out the old harness and rewire. Simple,easy and trouble free. The alt costs about $55.00. No way I would even consider a 3 wire or similar.I have found that even when the 3 wire is properly wired up,the old dilapidated harness just causes future problems.

charlieu · Nov 11, 2017

(quoted from post at 23:44:15 11/11/17) This is on a Farmall H, BTW.....

I have put together a kit that includes a Hitachi alternator that fits the Farmall H. The Hitachi alternator is the same diameter as the generator, so it fits.
My kit includes a new 45 amp alternator, brackets, bolts, diode/exciter wire, and a 12 volt ignition coil. It also comes with wiring diagram and instructions. My kit has the proper size pulley that fits the original belt. Check out my web site, charliesrepair.com

FBH44 · Nov 11, 2017

I have H with 10SI Delco that quit charging, and charlieU provided a clip-in diode assembly for the alternator that fixed it. Very economical. The thing charges right up on starting, the needle moves immediately to the right, then it tapers off slowly like it should. CharlieU knows what he's talking about.

old · Nov 12, 2017

I always use the 3 wire Delco 10SI. Cost if around $45 at O'Reilly's and comes with a life time warranty. Tell them you need an alternator to fit a 1980 Chevy pickup no power any thing no AC. You need a longer belt to make a good fit but it can be doe I know I have done more then one

glennster · Nov 12, 2017

i used the hitachi on one of my farmall m?s. nice compact fit. i got it from napa, came with the pulley. pulley takes the narrow belt, but all you do is remove the nut and washer, the pulley is two piece, place the washer between the two pulley halves and put the nut back on. easy peasey!!!!

gmcdeadhead · Dec 25, 2017

im going to do the 12v conversion on a 1945 w4, i want to use the delco 3 wire , since there readily available. what do you do with the magneto? also can i use a volt meter instead of a amp meter. the volt meter will tell me if the battery is getting charged from the alternator output.

12v Conversion AGAIN....

Dachshund

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Dachshund

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Janicholson

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pinball

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tractorguy2

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DeltaRed

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charlieu

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FBH44

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old

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glennster

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gmcdeadhead

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