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Farmall & IHC Tractors Discussion Forum
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12 volt alternerator for 1940 Farmall?

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CrazyCooter

05-12-2006 13:42:21




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What kind of alternator will fit on this tractor without cutting the hood? I just finished the body and repainted it, just need it to charge. I can't afford to have my generator rewound right now. Thanks for any ideas or advice!




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CrazyCooter

05-13-2006 18:40:29




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
Good replies! Thanks guys. One more question what all will have to be changed in the order of wiring besides the jump wire on the alternator. I am not using a coil on this one. Just run a wire to the battery, or will this run the battery down too fast? I have seen where a one wire setup will run them down, the question is, how long will this take? Thanks again for the help! I will try to get the pictures of her in her new red suit loaded when I get my camera working.

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Bob Cornwell

05-22-2006 09:18:01




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-13-2006 18:40:29  
Hello, I just completed a conversion on my 230 farmall, I really dont' recommend a true "one-wire" alternator you will likely want a 3-wire.
check out these web links, they have great info.

Link

and

Link



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F-Dean

05-12-2006 18:43:14




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
BIG JOHN has been putting a Hitachi #14231 alternator on several tractors in place of a generator under the hood. This alternator was used on 1978-79 Nissan 620 pickup with a 2 liter engine and a 1980 Nissan 720 pickup with a 2 liter engine. At NAPA it is part #2138130. The cost of a rebuilt alternator is approximately $50 + core (And they won’t take a generator as a core). The alternator is 4 1/2" in diameter and 7" in length and will go right on the original mountings on the tractor. Use an 8" x 3/8" bolt and some pipe for spacers. Being Hitachi means that it is METRIC. You will need to drill out the mountings to 3/8". The tension adjusting bolt is also metric thread. The alternator is a three (3) wire set up which can be converted to one (1) wire. There are spade connections labeled S & L and a BAT post connection. The L spade is for the idiot light and can be disregarded. Use a jumper wire from the S spade to the BAT post and you are good to go. The pulley may be a split type that you can widen using a spacer (once again metric). You will need to use a disc type lock washer and some “Locktite” because there won't be room to reuse the split lock washer that comes with it. I put the washer between to parts of the pulley to make it fit the existing belt.
There is a built in regulator and a resister to keep the battery from feeding back to the alternator. This is a sweet fit under the hood that he has used on H's, M's and W models, also Cubs and many others. I add the following from my experience:
Be sure to switch the polarity of the battery to Negative ground to avoid damaging the Alternator.
Consequently, you need to switch the wires on the coil, if you are using a coil.
Use a plastic covered connection when you connect the jumper wire from the S spade
On a Farmall M, turning the bracket upside-down will allow the alternator to fit nicely inside the hood using the existing generator belt.

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wh

05-12-2006 17:10:15




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
the gm alt. will fit fine. have them on 3 farmall h's. i did install a "idler" pulley below it so i could properly tension the belt. used a idler from a riding mower deck.



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El Toro

05-12-2006 17:05:45




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
You could use a Hitachi sold through NAPA. Their P/N is 2138130. Hal



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DCW

05-12-2006 14:09:35




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
I used a Delco alternator off a late model S-10 ON MY 41 H.It was tight fit,but it works like a charm.I didn't need to modify my hood at all.Its a 74A ALTERNATOR,should have no problem handling 3 lights and an ignition coil.You don't want to put that Japanese junk on your good tractor.



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CrazyCooter

05-12-2006 14:07:49




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
Sorry I wasn"t thinking. It"s a 1940 Farmall H.



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old

05-12-2006 13:58:09




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 Re: 12 volt alternerator for 1940 Farmall? in reply to CrazyCooter, 05-12-2006 13:42:21  
That would maybe depend on which model or tractor you have I know its a 1940 as far as year but what model?/ In the past I have used an alternator made for a toyata pickup, around a 1986 and they fit well under the hood



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