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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Steering column wiring question

 
  #1  
Old 03-16-2019, 12:24 AM
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Steering column wiring question



Photo by Uni Moe
so my son bought a 72 camper special and the PO put a column out of a 77 into it. Iíve been fighting it for awhile now and in retrospect I should have just bought a new column or at least the correct harness/ switch for it but Iím broke, so thereís that...anyway, the PO cut the 77 harness after the male end of the coupler and wired like colors together to the 72 harness. No brake lights, turn signals or flashers (the front emergency flashers work) also running lights work in front and back.
while searching the forum I found an old thread with a possible solution by Uni Moe, but Iím not sure Iím reading him exactly right.
this is his picture and it looks like to me you go :
yellow and black from 77 to blue and yellow on the 72
Dark green from 77 to orange and blue on the 72
Dark blue and yellow from 77 to Navy and Yellow on 72
light green and white from 77 to blue and white
White and blue from 77 to white and blue
Light Blue on 77 to Navy blue
Red and black on 77 to Dark green
blue and red on 77 to custom attach to dash lights

then white and red from 77 to maybe another white and red?
also not sure what you mean by ď2 plug and 5 plugĒ
Uni Moe, if youíre out there and can confirm this, youíre my hero!👍
 
  #2  
Old 03-16-2019, 07:12 PM
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The only wiring in the steering column is the T/S switch. 1973/77's use different T/S switches than 1970/72 (that use only one).

1973/77 F100/350 A/T is different than M/T, 1975/77 with Speed Control is different than the other two.
 
  #3  
Old 03-18-2019, 01:19 PM
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(later that same evening... Added some details as I found them. Should be mostly correct, but there are some discrepancies.)

Originally Posted by rhw View Post
so my son bought a 72 camper special and the PO put a column out of a 77 into it.
I'm kind of winging it here, so bear with me a bit. I did not count the wires or verify their colors yet (which might narrow it down) but does your '72 have a horn relay, or is the horn wired directly through the horn button?
One way to tell on Fords is whether the turn signal switch has one contact or two. These are the brass-tipped springy thingies sticking up under the steering wheel.
Another way to tell would be to look under the hood, but I'm not sure what a '72 relay would look like, if '72's even had relays available (which I think they did) but it's worth a look-see around the engine compartment anyway. If for no other reason than to know what you're dealing with.
On Broncos starting in '74 the relay was a 3-wire metal shelled rectangular affair with a single screw holding it to a sheet metal surface for grounding. A Yellow wire is usually running straight from a battery connection, often at the starter relay.
Does the horn work by the way?

(edit: Looks like at least some '72's had horn relays, if not all of them. So we'll work on the assumption that you still have a horn relay and go from there)

Originally Posted by rhw View Post
...anyway, the PO cut the 77 harness after the male end of the coupler and wired like colors together to the 72 harness. No brake lights, turn signals or flashers (the front emergency flashers work) also running lights work in front and back.
The running lights don't go through the column, so they're separate from this search at the moment. The brake lights and turn signals and flashers do of course.
And by the way, I'm only assuming so figured I'd ask, but does your column have the hazard flasher switch sticking out the side? It should I believe, but not 100% sure.

While you're doing wiring stuff, as was suggested in another thread today, it's not a bad idea to (with the battery disconnected just because...) remove each and ever fuse from your fuse panel, wipe/scrape/brush the contact surfaces clean (even if they look clean) and then simply put the fuses back in.
Just the act of removing and replacing the fuses will usually clean up any oxidation from the contact points that can resist flow and cause you electrical headaches while hunting down other gremlins.

Originally Posted by rhw View Post
Yellow and black from 77 to blue and yellow on the 72
Yellow w/black is the Left STOP/TURN signal lamp.
Honestly, Blue w/yellow sounds like the horn wire, but I don't have a '72 diagram handy.
Gonna' bail out on you for a bit and hunt down the diagram. But posting what I've got so far so you have a few things to think about.

(edit: Yes, Blue w/yellow is the horn ground to trigger the horn relay. Does not sound like it belongs connected to the Yellow w/black to me)

Originally Posted by rhw View Post
Dark green from 77 to orange and blue on the 72
Any chance that Orange is actually a faded/discolored White?

Originally Posted by rhw View Post
Dark blue and yellow from 77 to Navy and Yellow on 72
There is a second Blue w/yellow? This "navy" colored one is different from the other "blue" with yellow tracer?
I just don't see any other Blue-ish with yellow stripes. Only the horn ground.

Originally Posted by rhw View Post
light green and white from 77 to blue and white
Any chance it's White w/blue, instead of Blue w/white? White w/blue is the front turn-signal/dash turn indicator and runs through the hazard switch too.
Do the turn signal indicators work with the proper side? White w/blue and Green w/white are Right and Left front respectively.

Originally Posted by rhw View Post
White and blue from 77 to white and blue
Ok, well I guess that answers my question about the White w/blue. This sounds correct, but what are the others? I wonder if this is actually a '77 column and switch after all?

Originally Posted by rhw View Post
Light Blue on 77 to Navy blue
Just Blue is the power IN from the turn signal flasher. Nothing about light or dark in the book, so not sure if there was a change or not.

Originally Posted by rhw View Post
Red and black on 77 to Dark green
Red w/black is power IN from the brake switch. Should be matching colors for both years.
Green on the '72 "should be" the left rear running lights. Turns to Brown back at the lights to cross over to the right side.
This should be the same for both years, so again the the same colors should be connected it sounds like.

Originally Posted by rhw View Post
blue and red on 77 to custom attach to dash lights
Blue w/red is the common color for dash lights and comes from the headlight switch, usually through a fuse in the panel to work the lamp for the PRNDL indicator.

Originally Posted by rhw View Post
then white and red from 77 to maybe another white and red?
Should be Emergency Flasher power into the switch from the flasher unit.
Seems correct to have them connected together.

Originally Posted by rhw View Post
also not sure what you mean by “2 plug and 5 plug”
I believe that he's simply referring to the number of wires in each connector plug. You can see that the 5-plug has five wires and the 2-plug has two.
So that's my assumption. Again, "for the moment and until a better theory shows up"

Back in a bit with more info. Or hopefully someone with all that cool stuff memorized will chime in first!
Ultimately it sounds as if you're going to have to do some testing with a meter (both ohm and volt testing) to be sure you have everything simpatico.
Can you find a part number on the turn signal switch by any chance? That might help determine if this is actually a '77 switch, or something else.

Paul
 
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Old 03-19-2019, 03:17 PM
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Originally Posted by 1TonBasecamp View Post
I'm kind of winging it here, so bear with me a bit. I did not count the wires or verify their colors yet (which might narrow it down) but does your '72 have a horn relay, or is the horn wired directly through the horn button?

(edit: Looks like at least some '72's had horn relays, if not all of them.

And by the way, I'm only assuming so figured I'd ask, but does your column have the hazard flasher switch sticking out the side?
1973/79 F100/350 only.

ALL F100/350, Bronco's and Econolines have a horn relay thru 1977, as do 1978/79's with Speed Control.

1978/79: No Speed Control, no horn relay.

1973/79 F100/350: Emergency 4 way flasher switch made as part of the T/S switch, button protrudes from the right side of the steering column.

1970/72: Emergency flasher switch located on the right side of the steering column (see pic below).





























 
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Old 03-19-2019, 03:24 PM
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Thanks Bill. Finally found my '72 diagram and it did show the relay, so I was starting to "assume" (but you know where that leads...) that they may all have had them. But didn't know for sure, so I'm glad you spelled it out.
And by "all", how far back does the F100 series go? I don't remember the year ranges.

I think we've talked about how my '79 did not have one (did not have speed/cruise control) so I put one in. Did it on both my 350 and Bronco and am very happy with the results.

Thanks again.

Paul
 
  #6  
Old 04-03-2019, 10:28 PM
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Thanks for all the in depth research and help! You guys are awesome! Sorry Iíve been hijacked by my work for the last couple weeks and havenít replied before now. (Stupid bills interfere with all my truly important stuff!&#128514
so where I was, I had emergency flashers in front, not rear, had running lights all around, no brake lights or turn signals.
I tried following wiring diagrams from Fordification, and thought I had it as close as I could get -no change.
out of frustration, maybe desperation...I yanked the column out of my 71 XLT, put it in and all lights and flashers worked great.
sooo gave up on retrofitting the 77 harness and bought the correct one off LMC truck and the steering column flange ( without the side mount hazard switch) from NPD. Going to see what I can piece together tomorrow. At a glance I have a problem with the upper steering column bearing in the column flange. The 77 is smaller than the 72. Iíve checked our four local auto parts stores, LMC, NPD, CJPony parts, Dennis Carpenter and EBay...nobody showed one that looks close to this one.😕
tried attaching some pics. Does anyone know where I can find one of these? Rubber sleeve surrounding bearing.
thanks again,

72 column flange with too small bearinf

77 flange and bearing
 
  #7  
Old 04-06-2019, 03:38 AM
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Can you read that engerneering number that is inside the flange? I can see D4TA, but that is all... Maybe "Number Dummy" can tell you more info with that number.
 
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Old 04-06-2019, 02:16 PM
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Originally Posted by rhw View Post


77 flange and bearing
It's 1973/77, but there are 4 different types for 1973.

Once it's known to be A/T or M/T and if it's from serial number S40,001, it also fits 1974/77.

With A/T, before or from serial number S40,001 .. With M/T, before or from serial number S40,001.
 

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