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Conversion of 1951 TO 20 Ferguson Tractor to 12 Volt system

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12-16-2001 14:52:56

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I have a T O 20 1951 Ferguson tractor that I plan to convert to 12 volt negative ground. I purchase a GM 12 volt 1 wire alternator with internal regulator made specifically to connect to battery + post. The auto parts person also sold me a 12 volt coil with internal resistance. He said it would be okay to change out with the 6 volt coil. I will have to change the alternator pulley to make it match the crank and water pump pulleys. I know I will also have to fabricate an alternator mounting where the existing generator is located. I plan to change the lights later on to 12 volts. The gearshift activates the mechanical connection (solenoid) to the starter on this old tractor. I would appreciate diagram relative to the wiring installation from anyone to compare with mine (including ammeter insertion). I would appreciate comments and direction from those that have made this conversion. Bill H.

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John, IN

12-16-2001 16:58:18

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 Re: Conversion of 1951 TO 20 Ferguson Tractor to 12 Volt system in reply to Bill , 12-16-2001 14:52:56  
Hay Bill, go to this web site, a lot of good info on 12 volt conversion.
Also the link below has the print I used on my 12 conversion. Good luck

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Jim W

12-16-2001 15:43:00

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 Re: Conversion of 1951 TO 20 Ferguson Tractor to 12 Volt system in reply to Bill , 12-16-2001 14:52:56  
Sorry I can't offer a wiring diagram, but can make a few comments that may help (all theoretical):
-the ammeter goes in series between alternator's one output wire and the battery. There's a positive sign on it; that side goes to the alternator.
-the regulator that is now on the tractor is just not used anymore, since the alternator has one built in. What was the field wire to the generator isn't needed, so just tape it up and tuck it out of the way.
-the wire from the key switch that now goes to "L" on your voltage regulator, can be connected to the positive terminal at the battery. It might be more convenient to hook it to the solenoid though, at the same place the battery positive will go (not the starter motor side).
-don't change your lights later, change them now or they'll all blow as soon as you turn them on with your 12v system.
-regarding the alternator pulley - you may want to use a slightly diameter than what's on the generator so it spins a bit faster. This way you'll get charging even at very low rpm. Because of the segmented commutator on generators, they can only turn so fast, which is why they barely charge at low speeds. -you haven't mentioned your starter motor. If you were trying to be perfect you would switch to a 12v starter. A less expensive way is to use a resistor in series with your existing starter, so it still only sees 6v. (The other 6 is dropped across the resistor and dissipated as heat). But lots of folks just leave the 6v starter as is, reasoning that it only runs for a very short time anyway so it won't likely burn out. In fact it might even run for a shorter time because it will spin so fast your tractor will start right up! If you are going to eventually switch to a 12v starter, maybe you can just wait until you burn this one out and do it then; it could be quite a few years.

Could tell us the model number of the alternator you got, or what car it's meant for? I would also like to do this conversion.
Jim Wallace

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Larry in Missouri

12-17-2001 08:50:34

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 Re: Re: Conversion of 1951 TO 20 Ferguson Tractor to 12 Volt system in reply to Jim W, 12-16-2001 15:43:00  
I wouldn't worry about changing to a 12-volt starter. The 6-volt starter on these tractors is quite heavy-duty and can take 12 volts. In fact, when I put a new starter on my TO-30 I just bought the standard starter, even though I have a 12-volt conversion. No problems at all.

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12-16-2001 18:24:43

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 Re: Re: Conversion of 1951 TO 20 Ferguson Tractor to 12 Volt system in reply to Jim W, 12-16-2001 15:43:00  
Jim Wallace, The 1 wire 12 Volt alternator with internal regulator is a NAPA Part # 13-4011-SW. It is a rebuilt by NAPA. The 12 Volt Coil with internal resistor is also a NAPA IC 14 SB. Thanks for your input. Bill H.

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