wiring digram for 6 volt mag 1942 farmall H

Rich ORourke · Aug 26, 2008

I finally got the lights to work, but does anyone have a wiring diagram for a 1942 Farmall H with 6 volt mag system and two head lights and one headlight for the back impliment side? The tractor starts right up, but I do not have a clue where all the wires should go. the previous owner was no mechanic!!! Should I use all 12 guage wire? I want to make it like it was originally! thanks, I need to know how the wires should go from the generator to the voltage regulator and how they tie in to the foot starter switch and so on. thanks, Rich

ryanroth · Aug 26, 2008

go back a couple of posts for wiring an M. there is a link for Bob's diagrams. there is a diagram on that link. i have the same in a 44' model. Also try porch electric for authentic wire harness for this tractor. around $80

Janicholson · Aug 26, 2008

Here are the diagrams #4 is the one you will need I think. The light Switch system is detailed in a different diagram. JimN
Bob Ms marvelous diagrams

boomer22 · Aug 26, 2008

Try these they are the best I've found.

Click here ---> Bob's Diagrams

Anonymous-0 · Aug 26, 2008

If you are going to use #4 better put a wire from the F on the Gen to the F on the cut-out or it just wont work. You cant get the gen to charge without a wire from the gen to the cut-out.

Rich ORourke · Aug 27, 2008

thanks you very much,Rich

Rich O'Rourke · Aug 27, 2008

thank you very much

Rich ORourke · Aug 27, 2008

thank you very much, Rich

Rich ORourke · Aug 27, 2008

thank you, Rich

Janicholson · Aug 27, 2008

The mag is, as I stated, not connected to anything but the mag Kill switch in the electrical box. (push pull, on off switch)
That switch is a single terminal switch that grounds the wire attached to it when the switch is pushed in, and opens (allowing mag operation) when pulled out.
No modifications are made to any part of the ignition Mag or grounding switch or the single wire running to it.

Assuming a three wire SI10 GM delco alternator.

The alternator should be connected as follows:
a #10ga wire connects to the big "bolt on" terminal on the alternator. From there it is connected to the amp gauge, on the load side of the gauge (the side not attached to the Battery + side through the Starter Switch) Using a Fuse link saves burnt parts and fires. NAPA has them, (crimp on, not solder) JimN
New diagram for mag and alternator

JOSSETTE · Aug 27, 2008

dfg

wiring digram for 6 volt mag 1942 farmall H

Rich ORourke

Member

ryanroth

Member

Janicholson

Well-known Member

boomer22

Member

Anonymous-0

Well-known Member

Rich ORourke

Member

Rich O'Rourke

New User

Rich ORourke

Member

Rich ORourke

Member

Janicholson

Well-known Member

JOSSETTE

Member

Similar threads