6 to 12 conv.

rcarraway

New User
1959 340 farmall. was robbed of all 6 volt components. going to 12 sys. need to know where to start. sure is a good machine.
 
A Hitachi 14231 alternator fits well, and is more tidy than a Delco. The wiring is the same as the delco (I would not use a one wire system)
The #5 diagram in the link shows the diagram for a Faemall M. It needs to have a couple of modifications and an explanation. The Delco Shown has two small terminals. marked 1 and 2.
The #1 terminal is L on the Hitachi. The #2 is equal to the S terminal. Use insulated 1/4" female spade terminals to avoid the connectors touching in the alternator. You will need to reverse the leads on the amp meter. You will reverse the leads on the coil to match the diagram. You will need to add a ballast resistor (Chevy 64 V8 will do fine) as shown in the diagram ubless you use a 12 volt coil with no resistor needed. The diode can be a little thin in the wires. Putting it into the system and soldering the leads so that it forms a Z makes the leads double back on the diode and when taped up makes it stiff and less prone to breaking. (make sure the Band end of the diode (elecrtically) faces the alternator.
All bulbs need to be replaced with 12volt. Using LED headlights makes real light to drive by! and last hundreds of times longer than regular bulbs. Search the net for the correct base and shape. All other connections remain the same. The starter and relay will work fine and spin correctly with reversed battery connections (negative ground) Jim
Bob M diagrams
 
Charlie Updike has a real nice kit for that with bracket, hitachi alternator and instructions.

I would stay away from generic brackets.
 
(quoted from post at 07:50:16 10/30/13) Charlie Updike has a real nice kit for that with bracket,.

I went with the Chevy Alternator. Here is the basic schematic I drew up that will run the tractor. To connect the lights you run a wire off the ammeter. When I'm ready to run lights I will get on here to Yesterday's Tractors and have my new schematic drawn up. I like the single wire alternator very much. It squeeks at start up, but makes really good power.


 
Cut and paste, you can see the power the Chevy/Delco Alternator makes. No matter what I do I can't get rid of the initial belt squeak until the battery gets a full charge.

It consistently cranks that easy though. I use non-ethanol 93 octane and it doesn't matter if the tractor is hot or cold she cranks up that fast every time.

http://www.youtube.com/watch?v=gUa0q_XPgI8
 
Here are a couple pictures of a mounting bracket that I finished designing today for installing a Delco 10SI alt on a C-135 and C-153 engine used in tractors like the 340.
a134015.jpg

a134016.jpg
 

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