wiring a 72 f100 column in a 68 f100

[bones67]

I have a 1968 f100 that has what i believe is a 72 column in it. well what I'm wondering is where do.i wire it. i do not have a 4 wire plug and a 2 wire i have a7 or 8 wire plug and a 2 wire plug!?? Help

[Calfdemon]

You can either get the other end of a 72 plug and re-wire the truck side of you wiring, or you can get the other end of the 68 plug and rewire the column side. It should not be hard to do... same wires. I put a 72 column into a 67 before. Just rewire it according to the colors of the wires. There was not much of a difference, maybe one wire on each side was a different color and those 2 matched up.. All the others were the same colors if I remember correctly.

[bones67]

Well my question is i have an 8 wire plug and a 2 wire plug and on the column i have 8 wires. as seen in the first pictures there's the only unused plugs under the dash

[Calfdemon]

I do not have the time to do the research for you (I'm at work right now.. ) but take a look at the wiring diagrams for your truck and see what the wires are that go to the steering column. Then look at the wiring diagram for the 72 and see what wires go to that steering column. All the wiring diagrams you need are found here:
http://www.fordification.com/tech/schematics_h.htm

You will be able to see what colors match up and figure out which 2 wires are not used on the column. Once you have that info, if you cannot figure out what to do with those 2 wires, let me know what you find and I may have an answer for you as I have done this exact project before, I just cannot remember the details of the wiring (it was 3 years ago). But that is how I figured it out and once you use the wiring diagrams, it is pretty easy to do.

[Calfdemon]

I am actually taking some time to look even though I am at work. My first question is which picture is which from above? The top picture has the plug on it and the bottom picture appears to be hacked up with someone putting blade connectors on the end of each wire. Which one is the 68 and which is the 72.

Upon taking a quick look at the wiring diagrams, It appears that the 72 should have 7 different circuits going to it. Not sure how many wires as they may have 2 wires going to one post, but there should be 7 different wire colors. This is what I see: Green and white (left turn signal), Blue (turn flasher), Yellow and Black (left lamp), Green, (right lamp), White and blue (right turn signal), Red and black (stop and hazzard flasher), and Blue and yellow (horn switch).

Looking at the 67 wiring diagram (should be the same as 68 and there is not a detailed 68 on the site), this is what I see:
I see 8 circuits so there is at least 8 wires, but possible more if they doubled up on the posts. Still, should be 8 color schemes using what looks like 2 plugs...
On big plug:
Circuit 1 is Blue with yellow stripe... Horn. So that will match up to the Blue with yellow on the 72 column
Circuit 2 is White with blue stripe... Right turn signal. That will match up with the White and blue on the 72
Circuit 3 is Green with white stripe... Left turn signal. Match with Green and white on 72
Circuit 44 is Blue... Signal flasher. Match with Blue from 72
Circuit 810 and 810A are Red with Black stripe.. hazzard flasher. These will match up with the Red and Black on the 72.
I also see a circuit 10 on the diagram which shows it is Green with Red stripe. However, I can find it on the steering column side of the plug, but am having an issue finding it on the harness side.

The second small plug has 2 wires which should be Orange with Blue stripe, and Green with Orange stripe. These are circuits 282 and 283 and are the left and right light signals. The Orange with Blue stripe will match up with the Green on the 72. The Green with Orange stripe will match up with the Yellow with Black stripe on the 72.

Line up those wires as I listed and see what is left over. It may be the Green with Red stripe wire on the harness side of things. Let me know what the extra wire or wires are and which side they are on... Harness side or Steering column side. We will figure it out. But based on the wiring diagrams, everything I listed above should be there. Of course, with hack jobs by previous owners, it is hard to say what you actually have. That 2nd picture makes me wonder...

[bones67]

The first picture is of the harness side and the hacked up one is the column side of things. that's how i got it and it came with the female blade connectors so i just figured once i figure it out id just cut the plug and put those on since i plan to put a different column in it when i put power steering on it. right now its just to make it legal

[Calfdemon]

Before you cut that harness side plug, look and see if that Green with Red stripe wire is there and going into the plug. If so, see if it is solo or if it is coupled up with another wire. If it is coupled, that may be why I could not find it on the harness side of the diagram. It may be part of another circuit and just numbered differently. Anyway, check what I listed and compare it to what you have and let me know of any differences. Again, you can check my work as well by looking at the detailed 67 wiring schematic: http://www.fordification.com/tech/wirin ... iagram.jpg and the detailed 72 schematic: http://www.fordification.com/tech/wirin ... ing_06.jpg . Those links are to the actual pages that show the wiring for the steering column connection (turn signal switch) which is what I went off of. It would not hurt to print them both out and look at them as you are looking at the wires under your dash as well. Always helps to have reference material with you.

[bones67]

The wires i have goes as follows
harness side
big plug-
2 White with a blue stripes
2 red with black stripes
1 Blue
1 light blue with yellow stripe
1 dark green with white stripe
1 light green with white stripe
small plug-
1 green
1 yellow with black stripe
Column-
1 light blue
1 red with black stripe
1 yellow with black stripe
1 white with red stripe
1 green
1 white with blue stripe
1 dark blue with yellow stripe
1 green with white stripe

[Calfdemon]

Based on what you just posted, it is pretty straight forward.... Most of the wires pretty much match up. The only question is if you have the colors right on the harness side. After time, colors fade and change, so I would recommend following the wires up to get an unexposed part of the wires under some tape and see the true colors. Reason I ask is you list a dark green with white and a light green with white. I cannot see a dark or light green difference with a white stripe in a 68 harness. So I am wondering if you are seeing faded colors and listed one wrong. Or, do they go to the same place?? You listed 2 White with blue and red with blacks, and those will go to the same post in the plug.

Anyway, on the harness side, both white with blues line up with the white with blue on the column side. Those are for the right turn signal.
both red with blacks will line up with the red with black on the harness. Those are for the hazard flasher
the blue on the harness goes to the light blue on the column. This is the turn signal flasher.
the light blue with yellow on the harness goes to the dark blue with yellow on the harness. This is the horn
*** One of the green with white stripe wires you listed on the harness goes with the green with white on the harness. This is the left turn signal.
the green from the small plug goes to the green on the harness. This is the signal wire for the right side lamps
the yellow with black from the small plug goes to the yellow with black on the harness. This is the left side lamps.

So left over, you will have ONE of the green with whites that you listed on the harness side. You will also have the white with red stripe on the column side.

On the wiring diagrams, there is a circuit on both the 67 and the 72 that is color coded white with red stripe, and on both of them (circuit 385), it has a function with the hazard switch and flasher. So it definately is part of your setup. Most likely, the white with red on your column is going to connect to the left over wire on your harness side. You just need to figure out WHICH green with white stripe it is.... This is why I ask that you chase the harness under some tape to get a true color. One of those white stripes might have originally been yellow or orange and is now faded... Who knows. Look at both and see what you see. We can look the color codes up and get a better idea once we know for sure.

Anyway, you have 8 circuits on each side and they all will line up. You are only going to have one wire from each side that are different colors. The white with red will match up with one of the greens with white. You just need to figure out which one. The rest are easy...

[bones67]

Okay so my fronts work like they should. but when i click my left signal on only the front works. when i click my right signal on my fronts and both backs work

[bones67]

My rear harness is hacked...could it be from that? Can you buy just the rear light harness?

[Calfdemon]

Yeah, I think you are probably hooked up properly at the steering column now. More than likely, the hacked rear harness is causing your non-blinking rear left issue. You can chase the circuits and see what is going on and probably find the issue.

[bones67]

Okay well i have an issue. i checked the wiring fixed connections that looked off and made sure wires were matched correctly. still the same issue. although i found something interesting. i have a red wire going from the brake light switch to the driverside tailight and one from the same point to the passenger side tailight. to me it looked like all of the wires were there so i don't know why they would hack it? I did not unplug it to see if it effects my tailights or not. although i bet without it i don't have brake lights. I'm running out of options...in the rear wise everything seems right besides the spliced in red wire. and from the rear wiring to the firewall doesent look hacked. i don't know what I'm missing. i have a feeling if i want to fix my signals i have to elimenate that red wire, which means I'm going to have to fix the brake lights...ugh

[bones67]

I went out unhookeed the red wire at the switch no brake lights hooked ut back up...no brake lights

[Calfdemon]

If the only thing wrong is that your left rear light is not blinking when you hit the left blinker, then your problem is that the left turn signal is getting lost somewhere on its way to the rear light. Obviously the turn signal is working from the steering column or none of the left lights would blink. Since your front is blinking, then the signal is being produced. So your problem is going to be somewhere after where the left turn signal wire hits the left lamp circuit and after the split from front to back. Look at the wiring diagrams and follow the left turn signal to the rear left light on paper, and see what color codes you are dealing with. Then trace that circuit in your truck and look for problems. Using a voltmeter at various spots with your blinker on will help you figure out where the signal is lost.

Before you do all of that though, I would check your ground at the rear left. You may have something as simple as a bad ground. Although, all your other functions are working, right?