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6 volt to 12 volt

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Bob/Maine

12-12-2001 04:03:02

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Hi, can someone tell me what I need from the junkyard to change over my 6 volt to a 12 volt system? Thanks! Any help greatly appreciated.
Bob

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1PWRFULH

12-12-2001 15:02:22

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Re: 6 volt to 12 volt in reply to Bob/Maine, 12-12-2001 04:03:02

Bob M Will that link you put be the same for an H? I noticed at the top it said M and SM. Im guessing the same 10si alternator will still worm for an H? Thanks!

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Bob M

12-12-2001 17:12:38

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Re: Re: 6 volt to 12 volt in reply to 1PWRFULH, 12-12-2001 15:02:22

RC - The conversion instructions will work for an H too. Challenge is getting the alternator tucked into the smaller space under the hood on an H - it's a tight squeeze but it CAN be done!

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EZHangin

12-12-2001 04:45:38

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Re: 6 volt to 12 volt in reply to Bob/Maine, 12-12-2001 04:03:02

If you type in 6 to 12 volt or key words for a search at the top of the forum page , you will find so much information, including wiring diagrams and a step by step conversion process.
Give it a try , you will be amazed at the amount of info, most are letters just like yours asking the questions about conversion etc...and a great many helpful answers from other Farmall guys. If no luck , I will dig up URLS to wiring schems that I found.

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Bob/Maine

12-12-2001 05:04:37

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Re: Re: 6 volt to 12 volt in reply to EZHangin, 12-12-2001 04:45:38

Thanks! EZHangin.
Bob

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Bob M - w/link

12-12-2001 08:49:28

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Re: Re: Re: 6 volt to 12 volt in reply to Bob/Maine, 12-12-2001 05:04:37

Bob - Punch below for a step-by-step conversion article.

12 volt conversion article

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Joe Laleman

12-12-2001 21:41:28

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Re: Re: Re: Re: 6 volt to 12 volt in reply to Bob M - w/link, 12-12-2001 08:49:28

I may have something of value to add here. I bought a 1953 Super-M that had the 12 volt conversion never finished. The owner died, so I didn't have a chance to ask where all the missing parts were and what I needed to buy to finish the job. The wiring that was done so far was all wrong. The alternator already mounted turned out to be bad, so I spent time at junk yards trying different ones. The original bad one had the 1 2 terminal on the right side (facing away from the engine) of the alternator. Most of the other ones I tried had the 1 2 terminal facing towards the engine. All of the Delco Remi alternators had a pully larger than my original. The problem I found with the larger pully and the 1 2 terminal facing the engine was not a lack of charging, but that the alternator fit too close to the engine, the fan belt was now too small and I couldn't access the 1 2 terminal. The solution was to find one like my original with the 1 2 terminal on the right side of the alternator and to put the old pully on the new alternator. It fit closely to the engine and inside the hood. The other problem I ran into was that the exciter wire fed back current to the ignition switch and then to the coil. I have a single pole tractor key switch with the ignition and alternator exciter wire both on the same pole. After the tractor started, I couldn't shut it off. I went to Radio Shack and bought an in line fuse holder, a 3 AMP 200 Volt diode and soldered it inside the fuse holder. I put it in the line of the exciter wire and prevented the feed back of current. It was a $4 solution. I spoke to a auto shop that rebuilds alternators and they told me that the resistor or lamp in the exciter wire wasn't necessary. Perhaps the resistance helps pervent the feed back. If I were to do it all over, I would get a one wire alternator (internally excited) which is used on a lot of street rods now and forget about the 1 2 terminals or use one of the so called "buttons" that bridge across the 1 2 terminals. There's a local implement dealer who can install the internal units in your existing alternator.

I do have a question. How has most people found to be the best way to mount that 10 ohm resistor rated at 2 watts to prevent a problem with heat given off of it?

I hope this helps. I've learned alot in the short time I've read the postings on this board. I'm glad I have something to contribute.
Joe

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Bob/Maine

12-12-2001 14:07:47

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Re: Re: Re: Re: 6 volt to 12 volt in reply to Bob M - w/link, 12-12-2001 08:49:28

Bob,
Thanks a lot, and God Bless you. this will work just great!
Bob

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EZHangin

12-12-2001 09:16:44

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Re: Re: Re: Re: 6 volt to 12 volt in reply to Bob M - w/link, 12-12-2001 08:49:28

Bob,
Thanks for putting this up again.
This is the article I used to re-wire my 44A.
I installed the warning light as you said, mounted it just below and to the right of the rotary switch. So far though, the light does not go out! I show a discharge on the gauge when I first turn on the switch, and also when I turn on the lights. But the warning light stays ON. Maybe my alt. is bad.
I am having troubles right now with carb/governor and have not had the tractor running for more than 5 mins. at a time since the restore.

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Bob M

12-12-2001 11:21:43

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Re: Re: Re: Re: Re: 6 volt to 12 volt in reply to EZHangin, 12-12-2001 09:16:44

EZ - Presuming your wiring is correct, the warning lamp light staying on and no charge indicated on the ammeter could be a couple of things:

1 - You haven't spun the alternator up fast enough to "turn it on". After starting try running the engine up to full RPM - that should extinguish the warning lamp and cause it to charge. The alternator should then continue to charge (and the warning lamp will stay dark...) all the way down to low idle.

2 - The alternator may be bad. If #1 above doesn't work, take the alternator to your local NAPA, Auto Zone, etc. - they'll test it for free.

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12-12-2001 13:55:32

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Re: Re: Re: Re: Re: Re: 6 volt to 12 volt in reply to Bob M, 12-12-2001 11:21:43

Bob,
I did actually have the tractor up to high rpm, but no warning light out.
I have the original pulley on the alt., it is sharing a belt with a power steering pump which is used for hydraulics. The belt runs on the bottom portion of pulley and spins the same way as the fan.

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Bob M

12-12-2001 17:20:59

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Re: Re: Re: Re: Re: Re: Re: 6 volt to 12 volt in reply to EZ, 12-12-2001 13:55:32

EZ - Could be you've got a bad alternator, or else it simply isn't getting spun up fast enough for it to turn on. Probably the best thing to do is take the alternator your local parts place and see if it tests OK. If it does then you'll need to find a smaller pulley to go on the alternator so it spins faster. What's the diameter of the pulley you've got in it now? It should be greater than about 2-1/2" if the alternator's driven off the small pulley machined into the back side of the fan hub.

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12-12-2001 20:58:17

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Re: Re: Re: Re: Re: Re: Re: Re: 6 volt to 12 volt in reply to Bob M, 12-12-2001 17:20:59

Look's like it is small enough just like you say.
I'll pull it and get checked out.

Thanks for the info and Merry Christmas from Northern Ontario Canada. We are having weird weather. Almost 50 today with a light rain. About 4" snow, easiest ever getting the Chrismas tree.

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