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Farmall & IHC Tractors Discussion Forum
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Hitachi alternator wiring instructions needed

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llerrit

12-10-2004 09:40:26




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Just bought a Hitachi alternator (NAPA #2138130) to put on my Super H. There are two spade connections that are not labeled. They are at right angles with each other. Which one is the S spade that I connect to the BAT post?




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F-Dean

12-10-2004 19:18:50




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 Re: Hitachi alternator wiring instructions needed in reply to llerrit, 12-10-2004 09:40:26  
I just finished putting a Hatchi Alternator on my M using guidance from BIG JOHN and Bob Melville.
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 is 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. According to BIG JOHN, 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 step-down resistor to the coil to keep it at 6 volts 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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farmallhal

12-10-2004 10:50:51




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 Re: Hitachi alternator wiring instructions needed in reply to llerrit, 12-10-2004 09:40:26  
I just finished doing this on my 1951 H with a lot of help from a couple of guys here on the forum. My alternator has the identity of each spade cast into the case. If you are following Bob Melville's wiring diagrams here on this site S is the same as the 2 terminal shown for the Delco 10SI alternator in his diagram. I just looked at my tractor and if you position the alternator with the two pivot lugs down the S terminal is the higher one and runs in a horizontal plane. Hope this helps. If you would provide your email address I have quite a bit of information I can provide to assist you in this conversion if desired. A really neat conversion for the H.

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