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Farmall light harness issue - please help

A

AL Tractor Pickers

Member
Here is a picture of the rear work light/tail light combo wire harness plug. I will be splicing this plug into my "home made" wiring harness and would like to know how to determine what wire is what coming out of the plug so I can hook it up accordingly to the switch.
 

Picture
p50532.jpg
 
Can't remember exactly how that "T" plug is wired, but it's real easy to just pop the rubber off the fixture and take a look inside.

Allan
 
A battery and a VOM meter OR just a VOM meter with a battery in it to check for continuity...if I understand the question.
 

If you open up the unit, the inside of the plug (male) has the wires coming out of it in a straight row. I don't really see any way to be able to tell what is coming from what.
 

I don't understand what you are saying. I am wanting to determine which wire goes to which function once the plug is plugged into the male side which is mounted on the back of the light itself. I am not real good with electrical stuff, so you might have to "draw me pictures". haha
 
Ya gotta do like DaveH suggested below. Get a ohmmeter and chck for coninutiy on both the plug and the fixture, to figue out which wire feeds which pin on the harness, and then twhat each mating pin on the fixture runs to.
 

The fixture shoudn't matter since it just plugs right in. Right? How do I go about checking it with the method you guys are talking about? I have a multimeter, but really don't know how to use it either. Sorry for the electrical ignorance.
 
I was really hoping someone knew what each wire was designated for. That would be the easiest way to figure it out. Surely someone out there knows. For example, looking at the plug going clockwise; what does each "pin" represent??
 
They are trying to tell you to look inside the light. Take the bulb out and look at which wire is connected where. The colored wires continue inside the light... Red, black, white.

Black is usually ground.

Red is probably for the flood light.

White is probably for the red tail light.
 
That looks like the connector for the flasher unit. The diagram is usually on the side of the flasher, Ine wire goes to the hot rrom the lights, one is usually a ground, and the tird goes to the lights. From the lights to ground. if the flasher has only two terminals, the two just go in line with the hot wire from the lights. If this makes little sense, you really need someone to help you on site. Old automotive books are also good. Jim
 

Thanks Jim. I am only aware of the amber flashers on the tractor; which doesn't go to this plug. My 140 caught fire; therefore all wiring harnesses, plugs, flashers, etc. burnt up in the fire. The plugs on the backs of the lights were ok, thats how I knew what kind of female end to get. This end came off of a 504 that I had with the same type rear light. Basically, I am starting all over with the lighting system since everything was destroyed.

To the other reply: Once you open the light case, all wires on the inside are black. I actually figured out a few minutes ago. I ended up hooking my light switch to my jump box for power, and hooking a hot wire off of the switch. I simply tried each wire on the harness to see what they powered. It was pretty simple. Thanks for all your help guys!!!
 

They did, however there were 2 white wires and I still had to figure out which one was the ground.

Would any of you guys happen to have a wiring diagram for a Farmall 140 (later model with the rear flashers)?? I am looking for one like the Cub diagram I have. One found similar to the "blue ribbon service manual"
 

John, if I recall I looked at that diagram and its the one on the CASE/IH site. It seems like it is for an early 140 because I never did see the flasher system anywhere on the diagram. Maybe I am missing something though. Let me know what you think, and help me out if you can. Thanks.
 
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