12v wireing diagram needed

hello to all, and thanks for all the help you all have been. anyway back to work, i in search of a 12v diagram for my ford jubilee, all the wires have been striped off. here's what i have, i have a three wire alternator, and a key ingition the foor starter switch probley dosent work. i dont have any lights so i dont need that, the tractor was set up with a negative ground. can anybody help.

"i have a three wire alternator"
Can we assume this is a delco 10si?



"a key ingition the foor starter switch probley dosent work"
Are you trying to say you have a key start from a car and want to keep it that way?

I really do not like giving advise that will alter the saftey feature of the push button start on the trans but I guess we could if you are sure you want to go that way.

Here is a wiring diagram using the stock key switch and starter relay.



Ask questions about it if you do not already know because it does not use some stock parts like the coil and one way diode.

your pic shows a relay, it that the same thing as a solonoid, im used to seening some thing like this. i'll probley used the starter button on the trans, but yea i was talking about useing the key ignition only.

I just rewired my 640, which had been previously converted to 12 V with a 3 wire Delco alternator like yours. It also used an automotive ignition/start switch and an automotive style solenoid (called a relay in the diagram -same thing). I didn't like that the transmission start switch had been bypassed, which allowed the tractor to be started in gear. My advice is to throw away the automotive solenoid and replace it with the one used on the 12V diesel model (they appear identical visually but are wired differently internally). You can keep the automotive switch - just don't use the start terminal. The small terminal on the right side of the solenoid(looking from the front of the solenoid) is powered from the accessory side of your switch and the small terminal on the left grounds through the transmission mounted start switch. Be sure to wire in the diode, (50V 3 amp at Radio Shack - about $3 for a pack of 2)) otherwise your tractor may continue to run after you shut it off. Alternatively, you could also power the white wire to the alternator from the accessory side of your switch to isolate the alternator field from your ignition circuit.

"your pic shows a relay, it that the same thing as a solonoid"
Yes

"i'll probley used the starter button on the trans, but yea i was talking about useing the key ignition only"
You need to make up your mind what one you will use. This will allow us to tell you the correct parts to buy; and save me a lot of work explaining how to do it one way and then you decide to do it another.

Your tractor came with a relay (solenoid) like this



But you can use one like in your picture. The only difference is the one in my picture will allow the engine to crank (not start) without a key; the one in your picture is much better especially if you have young kids around because you must have a key to crank the engine.

My wiring diagrams use stock parts so they might not fit every way of doing a conversion. I will talk you threw any way you like.

For instance; look at this diagram from the newer tractors 1959 to 1964. It shows the relay in your picture because that is the part used stock on those tractors but it does not show the one way diode you must have because those tractors used a dash warning light.



Think about it..... Ask questions...... Decide what way you want to go and we will go from there. I wish there was a quicker way but with a whole list of parts that can be used; many that will not even work on tractors; its best if we both get on the same page before we start.

You might want to read the piece I did about 12v conversions several years ago. It may help you better understand the process.

<a href="http://www.ytmag.com/cgi-bin/viewit.cgi?bd=ford&th=344550">12 volt conversions</a>


Be For warned. I work out of a suitcase some days so it may be several days before I might answer a question. There are many here that can help you as good as I can and I know they will step in and help if needed.

Wow, this was a great discussion, guys. I needed a diagram for my 640 to restore my auto style ignition back to original (12v/delco alternator). Thank you!!

thanks for the help, ok, im going to use the three wire alternator, a solonoid, and a key ignition switch, the tractor is a negative ground, and i didn't see a waring light anywere on the dash, do i need it. i really apreciate all the help. I too live out of a suitcase a few day's out of the week so i know how it is. thanks any help would be great.

I read your 12v conversion post and i have a question about the coil, the coil i have does not have a internal resitor, is read that you dont like this type becaue of the extra wires, but could you explain how to wire this type if possible. thanks for the help.

I answered your questions in a seperate post.
Attention rgvnaa