Worth the 12v Conversion? and couple other ????

Fullers Farmalls · Apr 12, 2011

As many of you know i just got a Super M and it has a 12v conversion. Starts in under 2 seconds of cranking. My 44 h takes for ever to start. Sometimes 20 to 30 seconds. plus messing with the carburetor. Which needs rebuilt as it leaks gas like no other. Would appreciate some input as to what to do about the carb. Finally if i go with 12v what alternator should i look for from the junk yard? as to make of car or will they know when i ask? My tractor has a magneto will this affect the conversion? Finally Can i use the existing wiring harness or should i update it?

oldtanker · Apr 12, 2011

Fix the carb first and see if that helps the starting issue.

If you use the 10SI GM 3 wire alternator you have to run the wire from terminal 2 on the alternator to a switch with a light or diode in line. Don't have to do anything with the Mag. A GM one wire will just hook up to the Amp meter. If you flip the generator mounting bracket over it can be used as the bottom alt bracket.

If you old wiring harness is in really good shape you can reuse that. If not rewire it.

Rick

Janicholson · Apr 12, 2011

Mid 1980s Nissan PU will have a Hitachi alternator with pulley that fits and adjusts under the hood. L on Hitachi= terminal 1 on Delco. S on Hitachi = terminal 2 on Delco. Wire as Bob M wiring diagram shows (If mag look for Janicholson Mag in the archives). Jim

David G · Apr 12, 2011

I would get a mini alternator. The full size delcos are a real tight fit on the H.

Pete76NY · Apr 12, 2011

Super Ms (Ms in general) with good tight engines that have real good compression do tend to stretch the 6v system a tad. I have no info on alternators for you as every time I see an alternator on an old tractor I gnash my teeth, and if I get one that has a BIG old ugly alternator hanging out the side like a goiter I rip it off and change back (I love my red tractors just like all the other colors but the green and yellow guys were smart enough to have switched their bigger bore tractors over to 12v by the time Super M's came along!) Although a properly tuned 6v system with a high cca battery will work, here are two viable alternatives if you are concerned about appearance as well as functionality: take your 6v generator and voltage regulator to a shop and have them bench matched for 8v, go to Tractor Supply and grab an 8v battery...the tad bit more will make a difference...or take your 6v generator to the same shop and have it rewound as a 12volt, do your rewire and rebulb and run her hard!

mkirsch · Apr 13, 2011

One of the biggest reasons for converting to 12V is to get rid of the cantankerous generator and mechanical regulator system, in favor of an electronically-regulated alternator.

Put a kit in the carburetor and get it working right. If the tractor cranks over decently on 6V and the generator charges, that's all you need.

rustyfarmall · Apr 13, 2011

I've got a 1950 H with the original 6 volt system. It starts with less than one revolution of the engine. 2 seconds or less. The ONLY reason to change an H over to 12 volts is IF the generator is no longer functioning and cannot be repaired, and the only reason even then is that a 12 volt alternator is less expensive than a rebuilt 6 volt generator.

oldtanker · Apr 13, 2011

(quoted from post at 07:48:42 04/13/11)
I've got a 1950 H with the original 6 volt system. It starts with less than one revolution of the engine. 2 seconds or less. The ONLY reason to change an H over to 12 volts is IF the generator is no longer functioning and cannot be repaired, and the only reason even then is that a 12 volt alternator is less expensive than a rebuilt 6 volt generator.

LOL two more things in favor of converting......compatability (I'm farming with both 12 and 6 volt equipment, one voltage makes things easyer) and battery chargers. It's getting to where a 6 volt charger has to be looked for and more so with the bigger chargers that I like.

I just did my M and am going to do the Ford 8N later this month. Besides now that my wife and daughter in law are helping out around here things are better if they have to boost or jump start they can just hook up and go. Right now everything starts like it's supposed to but Murphy is out there somewhere!

Rick-the converted...LOL

Red Farmer 84 · Apr 14, 2011

So, you can flip the old generator mounting bracket over for an alternator bracket??? Can I see pictures? Exactly how is it fastened? How does it look? I'm glad someone has finally found out you can do that because I hate those ugly old homemade cobbled brackets!! Haha.

Farmallhal · Apr 14, 2011

Just remove the original two IH cap screws and turn the original IH generator bracket upside down and reinstall the original dot head bolts in the same holes as before. It is as simple as it sounds. By turning the bracket upside down the alternator is moved to a position about an inch or so higher where you have some excess room available. In fact, I was able to use the existing IH generator belt with the alternator I used and still had a small amount of adjustment available if needed and didn't have to play with the adjustable split pulley on the fan. I used the Hitachi 14231 alternator which is about an inch smaller in diameter then the Delco 10-SI everyone talks about but they are too large for the H under the hood unless you know vodoo magic or have other magicial powers.

oldtanker · Apr 14, 2011

Not so the Gm will fit under the hood of the H too. I just helped a guy do his. Not much wiggle room but it's in there without touching the hood. We did have to use the original split H pulley to have belt tension adjustment.
There is a little more room under the M hood.

As soon as I have someone here to help get the hood off I'll get a few pics.

Rick

David G · Apr 16, 2011

I disagree with you on the only reason to convert to 12V. compatibilty with batteries on equipment and reduced maintenance are definitely advantages.

Worth the 12v Conversion? and couple other ????

Fullers Farmalls

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oldtanker

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Janicholson

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David G

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Pete76NY

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mkirsch

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rustyfarmall

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oldtanker

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Red Farmer 84

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Farmallhal

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oldtanker

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David G

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