Farmall H Cooking batteries DRY.

gamehunter56474 · Jul 28, 2016

I have a farmall H. 12v conversion with GM Alternator. My coil is 12v internal resister... I have verified my wiring with 4 different diagrams. My amp gauge changes with the RPMs. I try to control the amperage with the lights but doesnt work past 1/4 throttle. is there an easy way to put in a regulator of some kind or something? Is this a problem with the alternator??? If so can i replace the internal elctronics on it to prevent overcharging?

Thanks... Ryan

jacksun65 · Jul 28, 2016

Internal regulator probably went out. You say its a gm but what type One wire two or three wire? Some have a wire to tell it to charge or not its called
a sense wire and is indepenant of the charge wire.

gamehunter56474 · Jul 28, 2016

its a 2 wire red and white.

guido · Jul 28, 2016

Hello gamehunterl56474,

Make sure you have agood ground. Check voltage at the battery, should be 14.2 volts max. Use a jumper from
the alternator body to the batt negative, see if the voltage is 14.2. Yoy can replace the regulator if its
bad,

Guido.

Brent Zappe · Jul 28, 2016

Please check you battery hook ups. Most alternators most be set up with Negative ground and a positive hot.

gamehunter56474 · Jul 28, 2016

Yes Negative Ground Positive HOT

souNdguy · Jul 28, 2016

which GM alt? 10/12SI

Is it an older one like a 10DN with a big external regulator?

If a 10/12SI Is it a 1 wire alt or a 3 wire?

If 1 wire, take it in for a checkup.

If a 3 wire, it should be wired as follows.

charge stud to the battery hot.

Charge stud to #2

#1 thru a small lamp or diode to a switched power source like the key switch. lamp can be like a 194, etc.

Now... this is important. the #2 is the voltage sense line. #2 needs to see charge or battery voltage with NO resistors,
diodes or lamps inline.

If you put a resistor or lamp inline from power to #2, this is what happens. that lamp or resistor drops some volts. #2 sees
that and thinks the battery is undercharging and raises charge output.

common vreg modules for that could be 14.4v but as high as 15.1

Post back some details.

old · Jul 28, 2016

2 wire??? The 10si should have 3 wires. Two on the plug marked #1 which is the excite circuit an the #2 which is the sense wire which tells the Regulator to shut off or slow charging if the battery is full charged so if it is not hooked up it could be the problem or the Voltage regulator is bad. Did you at any time try the stupid way of checking if the charge system was working by take on the the battery cables off while running?? If you do you fried the voltage regulator

Owen Aaland · Jul 28, 2016

A 10DN alternator may be wired with either two or three wires, depending on which regulator is used.

Steve@Advance · Jul 28, 2016

Look at the plug on the back of the alternator.

If the plug that goes in is square, about 5/8", and the terminals are parallel, like this = , then it requires an external regulator.

If the plug is long and flat, about 1" x 1/4", and the terminals are end to end, like this - - , then it is internally regulated.

If internally regulated, and it is wired properly, there is a problem with the alternator.
10si internal regulator wiring

Farmall H Cooking batteries DRY.

gamehunter56474

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jacksun65

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guido

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