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Farmall & IHC Tractors Discussion Forum
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Super M 12Volt Conversion

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LumbrJakMan

09-26-2005 14:14:58




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OK I got another question .... You Guys and Gals Help me out and I cant Thank you Enough . My Recent Project is a Super M I bought that was Stuck . Found Number 1 Cylinder had Spun a Rod Bearing , and Bent the Rod . My Rebuild Kit and New Connecting Rod have arrived . I have the Block and Crank at the Machine Shop. I wanna Install a 12 Volt Electronic Ignition I have the Pertronix set up in my 1953 Super M Puller. It was already 12 Volt so the change was fairly easy,. Can Ya walk me through start to finish on the Conversion from 6 Volt to 12 on this Project ?

Thanks in advance . Your Help is Gratefully Appreciated

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Bob M

09-27-2005 06:04:48




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 Re: Super M 12Volt Conversion in reply to LumbrJakMan, 09-26-2005 14:14:58  
LJM - presuming you're converting from a generator to an alternator, punch below for step by step instructions.

However if you're gonna use a 12 volt generator, post back - between John T and myself we'll help get you up and running!



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LumbrJakMan

09-27-2005 07:31:34




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 Re: Super M 12Volt Conversion in reply to Bob M, 09-27-2005 06:04:48  
Bob . Cant Thank You enough for that reply. I am a Union Electrician , and I take Buildings from the ground up and wire them throughout. For some reason though when you cut my sign wave in Half and make it DC I get a Little Confused. I appreciate the post and the Schematic . Some guys around here are Using One Wire Alternators .... Any feedback on them ??

Tnhanks ....



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Bob M

09-27-2005 07:53:58




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 Re: Super M 12Volt Conversion in reply to LumbrJakMan, 09-27-2005 07:31:34  
IMHO the stuff you work on (building AC systems) is a h*ll of a lot more confusing than DC tractor electrics. So don't be underestimating your electrical abilities!

Regarding one wire alternators, I'm not fond of 'em. Besides their higher first cost, they have a couple other drawbacks:

1) At startup they gotta be spun up quite fast to get them to begin to charge. Means on a slow-revving tractor you may need to run the engine up to near full speed before a single wire unit will "turn on" and begin charging. (Once turned on they will continue to charge at low speed however...)

2) Single wire units all seem to draw a small amount of standby current when shut down. Not a problem if you run your tractor fairly frequently. But if it's gonna sit idle for more than a few weeks you risk a dead battery unless you provide a manual isolation switch somewhere between the battery and alternator.

For the few feet of extra wire and the price of a small light bulb (or resistor or diode) I much prefer a 3 wire alternator!

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John T

09-27-2005 06:19:31




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 Re: Super M 12Volt Conversion in reply to Bob M, 09-27-2005 06:04:48  
Bob, I just knew you had that all done n printed out somewhere before. I try n save some generic answers myslef, but the only problem with one size fits all answers is they get long winded n can cornfuse the questioner lol. Thats NOT the situation regarding converting that one particular tractor or family of tractors like this post. You ever get to any shows here in the Midwest?? It would be fun to get together n swap some lies, you tell yours first lol. I give electrical seminars at a few shows but thems all John Deere, do you bleed red only???

John T, another sparky

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John T

09-26-2005 14:33:25




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 Re: Super M 12Volt Conversion in reply to LumbrJakMan, 09-26-2005 14:14:58  
Jak, The good man Bob M and the other gents already have a real good wiring diagram to show ya (or post the link) which Im sure they will post, so I will only add a few basics. No use in re inventing the wheel all over again lol

First, I would convert to Negative ground cuz most alternators are for that (if youre using one versus a Generator) and it may be more standard for that Pertronix Ignition, although they may have either in stock. You could still use a Generator at Negative ground (or Positive)provided the ammeter is wired correct and you get a suitable 12 volt VR.

Change the charging system..... ..Change the Battery to 12 volts and choose your ground BE SURE IT MATCHES THE PERTRONIX UNIT..... Polarize if you use a Generator..... ....I recommemnd a Pertronoix High Performance 12 volt Coil to match their switch (wire its polarity to match the switch n ground) If you used a 6 volt coil you would need to add an external voltage dropping (12 to 6) Ballast Resistor..... .change any lights to 12 volts..... ..... change ammeter leads as necessary to make it read correct polarity. NOTE 12 volts works on a 6 volt starter but it can be a lil tough on starter drives and/or flywheel teeth due to its high initial kick in touque !!!!

If you need more post back, but Im sure the forthcoming wiring diagrams and/or Links to them and the above ought to get you going.

Post back if youre using a Generator and what ground you choose.

John T, retired electrical engineer

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