farmall h electrical

bennyboy2383 · Apr 5, 2009

I just bought a farmall h and from the serial number i found that it is a 1940. i was wondering how to tell if this tractor has been converted to 12v or not. it does have a generator yet. the tractor didn't come with a battery, but it does say "positive ground" written on the tray. it has a magneto ignition. just trying to figure out if i have to get a 6 volt bat to try and get it running or if i can use a 12 volt to crank it over and get it goin

John T · Apr 5, 2009

Even if it was converted, since its a Magneto Ignition, aside from possibly burning out some 6 volt lights if you put 12 volts to them, EITHER a 6 or 12 volt battery should crank the starter over to get it running (Unless it was actually converted to a 12 volt starter which I doubt, in which case it needs 12 volts to crank it properly).

If you stuck a 12 volt battery in, it will indeed crank it over and pretty fast if its still a 6 volt starter, and since its a a Mag you wont harm the ignition

Id venture a pure "guess" it was and still is a 6 volt Positive ground system.

Since its an H and they arent that difficult to crank over, I'd use a 6 volt n wire it Pos ground n keep it at 6 volts and use a good heavy duty 6 volt batery and 00 gauge Battery n Starter n Ground cables, and get a good 6 volt genny and VR.

John T

Anonymous-0 · Apr 5, 2009

if your tractor doesn't already have a charging system install a 12 volt neg. system using an alternator that will fit under the hood not a generator they are to unrelaible 6 volt starters work fine with 12 volts because they were built to stand the high resistance of 6 volts a weak 12 volt will start your tractor when a good 6 volt struggles too

bennyboy2383 · Apr 5, 2009

would a 12 volt battery hurt the generator at all?

Bob Kerr · Apr 6, 2009

If you have a starter then it had a generator or needs one. If it had a generator, then it would also have a regulator (square shaped box with 4-5 terminals) or a generator cutout (rectangular shaped box possibly mounted on the generator itself with 2 or so terminals). 90% of all generator problems, that is the bad reputation you read here sometimes, come from dirty terminals either on the battery, starter connections, bad grounds including on the regulator or generator itself. I have 6 volt on my tractor and have only had one problem which was cause by a bad ground on the bracket that holds the regulator, couple turns of the wrench on the bracket bolts, and it was good to go! I honsetly think that 12 volts is too much for a tractor that has a starter as the biggest load. Unless you are running a huge sound system and an air conditioner ( and I am sure you aren't)you just don't need it. My H started up last winter at 10 degrees with straight 30 wt oil in it. It groaned, but it started and ran all day for three days plowing snow. It would have started up much easier if I had 10w30 or 10w40 in it.

JMOR · Apr 6, 2009

(quoted from post at 20:44:28 04/05/09) would a 12 volt battery hurt the generator at all?

You said it didn't have a generator, so 12v battery isn't going to hurt the generator that isn't there.

bennyboy2383 · Apr 6, 2009

i removed the hood this afternoon after work and found it to be a six volt system. unhooked the generator and lights. drained the quart of sludge out of the oil pan, drained the varnish out of the gas tank, and filled with new. used a 12 v battery i had layin around on just the starter and got it running, the carb is obvously gummy, and i have a clattering/ticking coming from the valve cover area. had to stop due to it getting dark outside, will pull the valve cover tommorow

farmall h electrical

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