Starter solenoid

n454mw

New User
Hi, I have a '53 model ford 850 tractor that has been converted to 12 volt. The solenoid that was on the tractor was a three post (2 large and 1 small), a wire ran from the small post on the solenoid to the starter push switch on top of the transmission to keep the tractor from starting in gear.

I've had to replace the solenoid and a mechanic friend of mine said I would most likely have to get a 4 post solenoid but that I needed to be sure and get one that was insulated where a hot wire from the key switch would provide power to one of the small post on the solenoid and a wire from the other small post would then go to the starter button. This was the only way to insure that starting in gear was not possible.

Has anyone ever seen a solenoid like what is described above? My buddy is extremely knowledgeable about electrical systems on cars and tractors, he told me that the auto parts could get me one but nobody there seems to know what I'm talking about. Would it be better to just replace the solenoid with a three post or would a four post provide some benefit that I'm missing. If a four post would be better where in the world can I find one.
Thanks
Mark
 
starter button goes to S small post.Run a wire from the key side of
the terminal block to the I small post.

HTH

Vito
 
By the way just to let you know there is no such things as a 1953 850 they did not first come out till the 1955 year model
 
ditto what old said.

53 is a naa
your old 6v 3 post solenoid would have worked fine on 12v.. same with the starter.

as said.. you can get an isolated base 12v solenoid..e tc...
 
That method would make it possible crank the starter only if the key was on.The original solenoid is the same as used on Ford cars and trucks from 37 to 49.You should use a 12 volt solenoid with an isolated coil.You can use the original 6V solenoid but you can expect coil burn out in the solenoid.
 
Your tractor came with a 3 post solenoid. They only make it in 6 volt versions but it will work using 12 volts. The problem comes in if you have a engine that has a no start problem. If you crank and crank the 6 volt will burn up from a constant 12 volts feeding it.

To get a 12 volt solenoid you have to move up to the 4 post version. You hook your orginal starter button wire to one of the small post. You will then need to add a new wire from the other small post to the key switch. This will also make it where the tractor will only crank with the key on.
Part numbers for the 12 volt 4 post relay.
Ford/NH and Tisco 311006
Napa ST542
BWD S103 (places like auto zone or oriellys will sell this brand)
If the place you go does not have any of the above brands they can cross from these numbers.
 

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