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Discussion Forum
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12 volt conversion on M

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Bob G

12-30-2002 14:08:29




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Is there a difference in the way you convert an M to 12 volt if it has a magneto? I've seen mention to converting a battery ignition, but in parenthesis it says not magneto. Is there an advantage to converting with a one wire alternator over the two wire? Any help would be apprecidated.

Thanks,
Bob G




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karl f

12-30-2002 22:56:01




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 Re: 12 volt conversion on M in reply to Bob G, 12-30-2002 14:08:29  
you will need a switch that will accomplish two things at once:
in the OFF position, it will need to be able to ground the mag, yet have an open circuit to the exciting circuit(the warning lamp circuit) for the alternator.
in the ON position, it will have an open circuit to the mag (so your tractor will run), and a closed circuit for the alternator exciter circuit.

i have heard NAPA has this type of ign. switch.

good luck.

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Dan

12-30-2002 14:14:49




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 Re: 12 volt conversion on M in reply to Bob G, 12-30-2002 14:08:29  
I believe if you check in archive section there is a complete description of the conversion by Bob M. Think it also covers a Magneto. I think it should be easier with a magneto since you don't have to worry about a resister ahead of the coil or an inline resister or light to make it so it will shut off. I have never used the 1 wire type. Have converted a SMTA and JD430 to 12 volts but always got an alternator from the wrecking yard. Only advantage I can see is 1 wire.

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steve

12-30-2002 19:33:36




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 Re: Re: 12 volt conversion on M in reply to Dan, 12-30-2002 14:14:49  
Having a mag is no problem, dont even concern the type of battery. The one wire alternator is set to "start charge" in the 2000 RPM range for speed boats or custom trucks. Trouble on a tractor is getting it to kick in and start charge. Some guys install real small pulleys to make it spin faster, some guys rev the motor wide open. I personally like the factory GM alternator with the two prong plug. Not really that hard to wire up. Look for a mid 1975-85 chevy style Delco 10SI.

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