White 2-135 Lights

I have read this page for a long time but have never posted anything. I have a 2-135 White red stripe I am working on, the lights havent worked since I have owned it and I would like to fix them. It has a four position switch on it with six spades on the back. The four positions are off, day, night and field; on the back one wire runs the head lights and dash lights, one runs the warnings, one runs the tail lights and one runs the field lights. There are two wires that dont do anything, one of which I assume is the the power wire, which is not working. My question is what would the last wire be used for and does anyone know where the power supply comes from? I am also not getting power to my turn signals. I have been unable to find a wiring diagram for this tractor.

Also on a side note, this tractor had iso couplers on it, like the ones in the link below, that worked fine in spring of 22 but in fall of 22 I couldnt get them to work. The hose would hookup but oil wouldnt flow through, you could see the outlets move from pressure building but the implement wouldnt move. I put a male coupler in them with nothing on the other end so oil should pour through and nothing came out. I changed them to just a regular female coupler and they work fine. Has anyone ever seen this before or can they tell me what happened. Thanks
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I'm guessing the levers are not moving the piece that turns them on and off in the coupler body. Either have to change them or dismantle and fix them. OR leave the other couplers on and leave the levered ones off from it.

You should be able to buy the service manual from the Massey Ferguson website. They have them pretty reasonable in a download version. Which is the cheapest/fastest way to go. You can get paper or a cd as well.

Is the last switch wire ground?

I'm not going to be much help with the wiring, but you had me scratching my head. You must have a series 2 red stripe then? The Series 3 red stripe doesn't have a rotary switch, they use several toggles, so in your search for answers, it should be the same as an earlier gray stripe.

Hello MM welcome to the inside of YT! Not a White Oliver guy but you know what happens when someone ..assumes.. something. Have you checked the fuses? Just doing a quick search suggests that the lighting circuits on your tractor are protected by fuses.