IH 140 late model wiring update

[Haas]

I figured out the lighting wiring on my late model 140 with factory alternator. The factory alternators started at serial number 62472. My tractor has turn signals, flashers, headlights and a combo work/tail light. The work/tail light is the one with a red light inside the work light housing. The red tail light and the work light have separate wires to the panel. The lights were working, but the flashers and one of the turn signals did not. I found that one of the 6 spade terminals on the 4 position light switch was broken off. After a lot of checking with a volt/ohmeter, I figured out the wiring and got the flashers and signals to work. There was one loose connection and the turn signal switch needed a second 12V power connection for the flashers to work. That power was supposed to come from the 4 position light switch and that was the broken off terminal. So I ordered a new switch. Apparently the switches have been revised and the new switch had the flasher terminals closed in switch position 2, 3 and 4 where as the old switch had the closed only in position 2 and 3. On the switch, position 1 is off, 2 is flashers, 3 is head lights, flashers and tail light, position 4 is head lights and work light. With the new switch having the flasher terminals closed in position 4 that meant that there was no way to turn on the work light and head lights without the flashers also coming on. So....I ended up not using the flasher connections on the new switch and adding a separate toggle switch on the panel to control the flashers separate from the other lights. Turns out I could have done without the new light switch. I wonder why the new light switch was different. I'm guessing that the turn signal and flasher switch has been revised to match the new light switch. If anyone needs help on how to wire these up, I'm an expert now and could supply a diagram of the connections.
 

[Farmallhal]

I knew a Missouri guy could figure it out even if they do live somewhere else now. I hope I can be as lucky once I start running the new wire harnesses on my Farmall 240. I'm having to do a little engineering on my lights as well as the moulded rubber sealing plug for the light housing and wires used on my original lights is no longer made by anyone. I think the same lights are used on a few models of late 1950's and early 1960's. They were made by Guide and Dietz and have a 3/4" hole in the back of the housing for the wires to enter for the sealed beams. Glad you got it figured out, Hal.
 

[RTR]

This is very good and valuable information. A diagram would be awesome if you had a good one drawn up similar to Bob M's diagrams. I went through this with a 1976 140 about 3 years ago (see my posts in the archives). I've also noticed that the new switches are different, and don't know why. I specialize in the offset tractors (have (10) 140s) and I'm still learning the wiring specifics of the late models like yours.

[Haas]

I"m gone for a week. I"ll make something up when I get back
and post it. Won"t be as nice as Bob M"s diagrams.
 

[RTR]

Doesn't matter. It's very generous of you and it's better than what is out there.....even from Case/IH. There just isn't ANY info on the 140 wiring after the alternator conversion took place. As long as it is able to follow it should be great. Microsoft Paint program is a nice tool when drawing such diagrams as these.

Thanks so much !
 

[Markin mo]

Haas,I would love to see a wiring diagram for a 140. I have a 140 high crop with the flashers and turn signals and have been trying to get them to work for a while. When you can, put up a wiring diagram. We'll all love you for it. LOL