M / MT 6 volt to 12 volt conversion

I spent the last hour searching but no luck...

I need some help identifying what 12 volt alternator that I need to convert my MT to a 12 volt system. Any other info would be great too.

I am not concerned about the correct police either.


Thanks

That's simple. You need an alternator like what was used on a 1980 Chevy Pickup no power any thing no AC. O"Reilly's auto parts has them for around $45 with a life time warranty. The wiring is simple and if you go up to the Farmall forum and look in the one about the alternator getting hot Bob posted a picture of how it has to be wired up

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">Any other info would be great too.[/i:654c4848f0][/b:654c4848f0]</font>"

The 12 volt conversion for the M/MT will be very similar to the 12 volt conversion for the Model 40.

The 12 volt battery will be [b:654c4848f0]NEGATIVE[/b:654c4848f0] ground.

Take a look at the photo below of the starting motor switch on "BW" our 54 Model 40T.



The "hot" wire from the starting motor switch is connected to the [b:654c4848f0]NEGATIVE[/b:654c4848f0] terminal post on the ammeter.

Take a look at the photo below of the ammeter and ignition switch.



Note the "hot" wire from the starting motor switch to the ammeter shares the same post as the "hot" wire to the ignition switch.

The [b:654c4848f0]POSITIVE[/b:654c4848f0] post on the ammeter is connected to the BAT post on the alternator.

Take a look at the photos below of the alternator.





Either a warning light or diode should be installed in the wiring from the ignition switch to the 1 terminal on the alternator.

Take a look at the photo below of the warning light.



The photos above display the correct wiring for the alternator.

You need to determine the type of 12V coil is to be installed on your M/MT.

One type of 12V coil requires an external resistor.



Take a look at the photos below of the ballast resistor.





The photo below displays the coil.



Hope this helps.

James, do you have any fuse protection in that system?

After a neighbor burned up his MF65 (but not beyond rebuilding) we installed a fuse, or circuit breaker on all our old tractors, as close to the battery as possible. Your first picture reminded me, as that's where did the fix.

Any GM delco three wire from the mid seventies to the late eighties. Do change the coil to a 12v no external resistor needed so you can avoid the fire hazzard from a
ballast resistor.

"[b:654c4848f0][i:654c4848f0]<font color="#6699ff">do you have any fuse protection in that system?[/i:654c4848f0][/b:654c4848f0]</font>"

Not on either Model 40.

The wiring diagram displays an inline fuse so will get one installed on both Model 40's.

The M and MT's have a 20 amp fuse.




The Model A's have a 20 amp fuse.


None of the Model 70 gas tractors.

Although the original wiring diagram does not include any fuse protection for the Model 70, probably should add an inline fuse on the three gas Model 70's.

Thanks for the information.

I'm interested in your old generator if you don't need it.