Alternator

[Duane Bill]

If I were to change a Farmall H from 6 volt to 12 volt what kind of alternator would I need so that it would still fit under the hood. Thanks Duane

 

[MoHillbilly]

Your simplest bet would probably be the GM "1 wire" alternator, and it would probably mount in the same location as your generator, if it fit under the hood.

 

[IH2444]

I understand that a small hatachi one will fit under the hood, but some bracket work is needed.

does anyone sell a kit for them I wonder ?

 

[IH2444]

The one on my little 90 Subaru should work it has a one bolt pivot point and the standard one bolt tensioning with the slotted bracket. Internal regulator and such. 60 amps.

 

[souNdguy]

If a standard delco 10/12SI will fit.. use it.. get a 3-wire job.. not the 1-wire. The 1-wire units generally need a few moments of real high rpm to self excite.. lots of antique tractors come real close to not getting high enough rpm to handle this, unless a pulley change was made.

The 3-wire jobs will start charging at 400-600 rpm just fine.

If the 10-si won't fit, look for a delco CS121 or CS130. ( the # denotes outside diameter in milimeters of the stator

Has S,F,L,P terminals, and the bat stud.

Only L and the bat stud are needed.. though you can use S as well.

Bat stud to the charge system.. L is your excite line. S, if used, can loop down to the bat stud as a sense line.. again.. not needed..e tc.

It's excite terminal needs 35-500 ohms of ressitance in line with it... and the battery hot terminal... also needs to be switched.. thus a line from t he ignition switch thru an appropriate resistor tot he L line will work. ( 35ohm/5w, .. up to 500ohm/ .5 w )

soundguy

 

[greygoat]

Want a 1 wire alternator to run faster, to get
excited at lower engine RPM? Change Pully size.
My Neighborly starter/generator rebuilder shop
has a large selection of pullys.

 

[El Toro]

NAPA has the Hitachi for about $50.00 and NAPA's P/N is 2138130. Hal

 

[Aaron Ford]

I have to second this choice. The hitachi alternator is a sealed jobber, while the others are not. The smaller size and nontraditional look lead eyes away from the mismatched alternator instead of toward it. The smaller size also lets it stay under the hoodline instead of hanging out. The smaller brackets and bolt holes better match an old generator. Here is a pic of mine and a pic from Bewildered. I used the Mitsubishi alternator because I had it. I only needed some 3/8 s/s schedule 80 and some all-thread to make it work.

​

The hitachi painted up would have looked fine.

Oh and it begins charging immediately. Holds steady at ~14.5 volts. Lights are excessively bright.


Aaron

 

[El Toro]

That's a nice and neat installation. Hal