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Wiring Diag for 400 farmall 12v alt conversion

B

biggerred

Member
Anyone got a diagram for a 400 with an 12v alternator conversion? I checked out all of Bob's diagrams, but nothing on a 400.
 
What makes your 400 different than any other tractor for which he has a specific diagram?

Simply pick one that matches your ignitions system and follow it.
 
Bobs diagrams do it. Here are some hints:
Use a coil that is for 12v with no resistor required, or the original with a mid 60s Chevrolet ballast resistor in its supply line from the Key.
From the same supply line run a 14 gauge wire to a marker light (filament type bulb) a 15 ohm 10 watt resistor, or a diode with the band toward Alt. Connect the other end of light or resistor, or diode to terminal #1 on the Alt.
Use 10gauge wire from the Alt stud to the amp gauge.
Reverse the amp gauge.
Put a fuse link into the wire where it attaches to the Starter relay battery connection. 14ga fuse link, or 40 amp plug style fuse holder and fuse.
Install the Battery negative ground.
Change all bulbs to 12v including the dash illumination bulb.
Jim
 
The difference is primarly in the ignition switch. The keyed switch has 4 (if I remember right) pins, and I know I can use the alternator through one of them without any diods or light bulbs, I just don't remember which one.
 
The 400 does not wire up like an M or H. There are many similar connections, but You can use the switch to "lock out" the alternator when you shut off the tractor so it is not "hot" all the time due to the batt hook up.
 
If the ignition switch has an ACC position, that is the terminal to use.
The ACC is on when the switch is on run, but not connected to the ignition terminal when off.
If the switch is stock, it might not have that option. A aftermarket switch will have it! Jim
 
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