MHF50 wiring help

I am currently at my wits end with this thing. Tractor has been in the family a while. I inherited it last year. I immediately had issues with the starter burning out and a battery drain. My uncle swore there was no need to change from the 6 volt starter. After 3 of those, I switched to a 12 volt starter and it solved the drain issue too. It works like crazy. Love this tractor. Fast forward a year in a half. I was working late one night, so I flicked the headlights on. 5 minutes later the wiring caught fire under the gauges where the headlight switch is. It burned up the solenoid too. It got hot enough that the wires burnt completely through. So here I am trying hard to figure out where everything goes. I have a new ignition cylinder, solenoid, wires, terminals, headlight switch, ammeter. Can anyone post a 12volt wiring diagram for this tractor? I can't seem to find one. The only thing I've changed is eliminated the push button for starting. I am probably going to grab a new terminal block tomorrow too. I have a single wire alternator, clutch safety switch(has two wires) to take into account too. I'm at a loss where things are supposed to go as the previous ignition cylinder was completely melted on the back, as was the ammeter. Battery checks out okay.

Go to --fergusontractors.org/fena---then resources---wiring. This will show wiring
diagram.

Everything they have on there is for maintaining the generator. So I have almost none of the components they have on their wiring diagrams. I have the original shop manual for the beast, but it shows 6volt. And again, shows options this thing doesn't have. Mine has a 12 volt system. And I'm assuming it's the same 12 volt system as what others have on their Masseys. Or at least eerily close.

Your 50 should be 12 volt from factory. Use the diagram to wire what will be same then
wire alternator. Gauges-lights-starter will be same wiring diagram.

I wish it was! My uncle is the one who converted from 6 volt to 12 volt. But he did that back in 92. This is a Massey Harris Ferguson 50. Made when the company was merging. I remember he custom made the brackets too for the alternator.

I found this early this morning while drinking my coffee. Its not from it, but I may be able to wire it up. I'm not very good with electrical. I learned most from my grandfather when I was growing up, and he avoided electrical. I can do minor stuff. But as for figuring out where everything was supposed to go, I'm at a loss for.


I think if this one works, I'll post up some pictures on it for anyone else.

UPDATE: All fixed. Alternator to 12 volt solenoid. Battery to solenoid. Solenoid to ammeter. Ammeter to battery post on key cyl. Ignition post on key cyl to resistor. Resister to 12volt coil. Starter post on key cyl to neutral safety switch. Neutral safety switch to side post on 12volt solenoid.

Most are fairly straight forward, good job. Did you put any fuses in? Might save you from having to rewire if something goes wrong again.

I figured the issue was the light switch before. I have that wired directly to the battery this time with it's own fuse. It still seems to be working great!