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Another 6v-12v question...

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JohnG(TX)

08-01-2006 15:42:51

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I know this has been beat to death, but here is another angle on the debate. I have a 1942 M that has a 12v battery, no charging system (that works), and a mag. I just recharge the battery when it gets low. The engine has 4" pop-up pistons and an 8060 head. Will 6v start the tractor, or do I really need 12v? I have a pile of 6v generators, and will have to buy a 6v battery for a Super C and/or B that I bought, so 6v will be in the shed soon. It would be convenient to keep everything 6v for ease of maintenance and parts, but only if 6v will start the beast. I am considering an alternator, but just have not gotten to it yet. All those generators are screaming "PICK ME, PICK ME!".

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jpc

08-05-2006 14:54:29

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

to john g (tx) would you be willing to part with any of your 6v generators ?
if so, then how much $ would you you be asking for one, and if you have any possable idea how much shipping would be to send it. - i'm in upstate ny
i only have 1 myself and it needs to be rebuilt. (for a model 200/super c )

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Dellbertt

08-01-2006 21:43:41

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

I had an H that turned over so slow you thought it wasnt going to make one revolution. But it always started. It had a mag. If your mag is hot and the M starts easy I would give the 6v a shot. What have you got to loose. Buy a good 6v for your C and see if the M will start with it.

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Dave S.

08-01-2006 18:47:59

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

John I agree with cowman. M's with high compression pistons are hard to turn over and a 12v alternator system will do a much better job with a lot less charging problems.

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gene (missouri)

08-01-2006 17:53:12

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

Install a 12 volt single wire alternator, amp gauge and 12 battery. The single wire alternator is cheaper than a 6 volt regulator. It's also cheaper than most generator repairs.

Once installed the electrical system should be trouble free for years.

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John T

08-01-2006 17:19:49

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

John, as compared to say a little A or B or C or even an H, that M takes a lil more HP out of the starter to crank her over. That being said, if I had an M and a 6 volt system, Id want the biggest heaviest highest Amp/hr and CCA honkin commercial battery that physically fits in the box PERIOD. PLUS Id want 00 Gauge battery n Starter n ground cables and have her grounded to like a big main frame bolt as close as possible to the starter. Then have that mag in top shape and clean fresh plugs and she ought to start maybe unless its like wayyyyy yy cold. When cold cranking Ive found it best to sort of depress the starter ONLY briefly to milk a piston up over on compression versus just keeping the starter engaged long periods. Im NOT a fan of converting 6 to 12 volts UNLESS its a bigger tractor like an M plus it MUST start at extreme cold temperatures.

John T

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CNKS

08-01-2006 17:06:45

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

I assume it has a magneto. If you are not using the charging system or lights, you probably have the belt off the generator. A good 12 volt is good for many starts before recharging. I wouldn't use a 6 volt unless you fix up the charging system -- no advantage at all. I agree with Cowman that 6 volt is marginal for an M. Everything has to be kept perfect for reliability.

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08-01-2006 16:15:46

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

I have 6V in all mine and never have any problems starting them. The trick to keeping a 6V turing the engine over is to use good heavy cables, with a good ground, cables and terminals kept clean, a good quality battery, and keep your starter clean and in good shape. My M has the IH fire crater pistons in it and if yours is like most IH prducts a turn or two is all it needs to start. so you don't need all that extra voltage to start it.

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El Toro

08-01-2006 15:54:39

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

The 6 volt battery should start it with a good battery, 00 battery cables and all connections
polished nice and clean. That includes the tractor frame where you ground the battery. Paint and rust are good insulators. Keep the engine tuned well with new plugs, copper wires,
points and condenser. Check the fire from the coil wire to see if its nice and blue. Those coils do get weak over time. Hal

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Nebraska Cowman

08-01-2006 15:50:50

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Re: Another 6v-12v question... in reply to JohnG(TX), 08-01-2006 15:42:51

The little $30 6 volt in your C won't begin to start an M it takes a BIG $95 6 volt and they were marginal at best. I wouldn't mess with it. Besides with little or no tweeking you can get one of those generators to put out 12 volts. Just a thought.

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John T

08-01-2006 17:25:01

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Re: Another 6v-12v question... in reply to Nebraska Cowman, 08-01-2006 15:50:50

Cowman, Ive gotta agree. Ive used 6 volt gennys to charge at 12 volts simply by changing out the Voltage Regulator to a 12 volt. Im NOT saying thats ideal or perfect or engineering correct and they dont charge at a very high rate IM ONLY SAYING Ive done it and it worked. Basically a genny dont know what its voltage is, its increased by turning it faster and/or increasing its Field windings current.

John T

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