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Farmall & IHC Tractors Discussion Forum
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alternator Swap

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Jebe

02-09-2007 13:12:31




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My M now has a real large 12 volt alternator on it . The prior owner actually cut the hood to make rooom for it. Of course I would like to find a small unit to replace it and get the hood done. What alernator would work for this application? Also with a new alternator Iam sure the wiring will not be the same as on the one I now have. Any idea on the wiring from old to newer style? Thanks




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little john

02-09-2007 17:24:50




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 Re: alternator Swap in reply to Jebe, 02-09-2007 13:12:31  
Over on the left under "Parts and Pieces" is a picture of a Delco alternator installed on an H by a Mr. whfromcullman al. It's a tight fit but it will work. I put one on my H.



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F-Dean

02-09-2007 15:47:28




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 Re: alternator Swap in reply to Jebe, 02-09-2007 13:12:31  
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 and/or washers 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 maybe a split type that you can widen using a spacer (once again metric). You may 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. I have installed 4 Hitachi alternators – two were split pulley and the most recent two were not.
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.
I have installed two Hitachi #14231 alternators on two Ms and two on F-20s without any problems.

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farmallhal

02-09-2007 13:39:47




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 Re: alternator Swap in reply to Jebe, 02-09-2007 13:12:31  
I don't know what size "real large" might be but on my 1951 M I have a very common Delco 10-SI alternator installed. There is lots of room for it on the original generator bracket. On my H where things get really tight I have a Hitachi 14231 alternator installed which is about an inch smaller in diameter then a Delco 10-SI and you certainly need any room you can get for a H 12 volt conversion. Neither one of these tractors have any rework to the hoods as they both fit fine with the alternators noted. I have belt adjustment room on both of these tractors as well. Hope this helps, Hal.

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