Re: 12 volt alternerator for 1940 Farmall?

Posted by F-Dean on May 12, 2006 at 18:43:14 from (67.72.98.83):

In Reply to: 12 volt alternerator for 1940 Farmall? posted by CrazyCooter on May 12, 2006 at 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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