Headlight harness ground

[Thunderfoot]

Got a couple of questions just for my clarification...

When I made the complete connection, this is what I now have on the passenger side with the ignition on:

No parking light with headlights
Turn signal stays solid
No rear turn signal, no flasher, no inside dash indicator.

So when you are saying that the "turn signal stays solid" with the ignition on,--- this is with the right turn signal turn on correct?
It's strange that the right turn dash indicator is not lit also... (it could be burnt out)

So, using my test light, I disconnected the connector between the steering column, and tested both sides of the connector with the ignition on. The only power I see is on the Blue-Yellow stripe wire that appears to be ground.

So when you put the test light onto the Blue-Yellow striped wire the test light lit (has power on that wire)?

Quote:
If I disconnect the Red Connector at the firewall (Passenger side #984, and test 984A I should see the light on the test light up?

Yep, that's the one for the park light...

Sorry, I steered you wrong on that one... you want to look at pin #11 on that connector for the front marker light... 984 is for the optional fender marker lights which may not be plugged into the light switch...
Do check this with just the park lights on... I know that the early years the front park lights would turn off when you turned on the headlights but thought I read somewhere that the later years this changed... so maybe the newer style light switch lets the park lights stay on with the headlights on...

Do the colors on the 70 cab wires match the 70 schematic?

[tboneshep]

Thunderfoot:

So when you put the test light onto the Blue-Yellow striped wire the test light lit (has power on that wire)?

YES

No Front marker lights on the wiring harness for the 68 or the 70

On the 70 cab steering wheel connector connector, Pin 9 schematics say Green & orange, I have yellow and black.

On the 70 cab steering wheel connector connector, Pin 10 schematics say Green & Red, I have Blue and Red.

On the 70 cab steering wheel connector connector, Pin 5 schematics say Orange & Blue, I have Solid GREEN.

Some of my color interpretations could be the result of poor sight, lighting, or color fading, will try to get someone else to visually compare.

[fordman]

the first one is correct the second one i can not confirm, the third one is corrrect

[Thunderfoot]

FordMan is also curently working on a turn signal wiring so he is good info on this as well...

This is long and detailed...


Ok I think that is right on the Blue - Yellow for the horn…

So here is how I would go about this with just a test light for the turn signal issue (will get that first then move to the park light)…

To determine if the cab wiring is ok / bad or column (turn signal switch) is the problem do this...

Unplug the connector to the column and check the cab connector side wires…

1. With the key off, take your test light and check to see if any of the pins have power on them (only one should the Horn - Blue - yellow)
2. Turn the key on to "Run" position and check to see which pins now have power on them (Pin 44 should BLINK) This is the power for the turn signal from the turn blinker… There shouldn't be any power on any of the other wires at this time…
3. Press/hold the brake peddle down and check pin 810, it should now have power…
4. Turn the emergency flashers on and check pin 810, it should flash…

Ok make note on all that, but hopefully most of it should be good…
Now you can take a short piece of wire and strip the ends a little to use a jumper…
On this same connector on the cab side...
1. Connect this jumper from pin 810 (if it worked or you can use pin 44) and go to pin 3/50 and press on the brake peddle. The left front turn signal and the dash indicator should come on. (we know this one works so this is a good test of the procedure)

2. Connect this jumper from pin 810 to pin 2/49 and press on the brake peddle. The right front turn signal and the dash indicator should come on.

3. Connect this jumper from pin 810 to pin 282 (5) and press on the brake peddle. The right rear brake light should come on.

4. Connect this jumper from pin 810 to pin 283 (9) and press on the brake peddle. The left rear brake light should come on.

If any of these didn't work then there is a problem in the wiring in the cab side…


Now to check the switch in the column…

If all of the above worked plug the connectors back together and do the following…

1. As your left turn signal is working turn it on and check these pins…
Pin 44 should be blinking and pin 3 should be blinking, and pin 9 (283) should be blinking…

2. Turn on right turn and check these pins
Pin 44 should be on or blinking and pin 2 should have power or blink, and pin 5 (282) should have power or blink.
If there is nothing on pin 2 or 5 then there is a problem with the turn signal switch in the column…
(If you don't have anything on these pins check the other wires to see if you can find any that have power and move them to these pins) NOTE: leave the horn wires where they are as that is working...

3. Turn the turn signals off and push on the brake peddle and check these pins.
Pin 10 (810) should have power - pins 9 (283) and 5 (282) should also have power.
If either of these pins 9 or 5 doesn't have power then there is a problem with the turn signal switch in the column…
(If you don't have anything on these pins check the other wires to see if you can find any that have power and move them to these pins)

Let us know how this all goes...

If there is a problem with the turn signal switch you can remove the steering wheel and look at the switch and see if you can see any problem with the contacts (dirty or broken wires to them)…
You could also remove the connector from the wires and pull this switch out and replace it with the one out of the 70 column (if it was good) Then plug the wires back into the connector...

[fordman]

you get an A+ for that thunderfoot. i wouldnt know how to check jumpering things. wow it seems so simple yet i didnt know this stuff.

[Thunderfoot]

Thanks Fordman... This should help with at least finding the problem area

[2-tboneshep]

test

[tboneshep]

Thanks ThunderFoot and Fordman. I'm right in the middle of changing beds, and I have Jerry-rigged some things to hold up the bed, have to complete this before the wind blows it over. I have attached a gif file of the current column and cab side harness that Fordman wanted to look at. All signal indicators worked in the same column before the switch over. I will have to study your extensive tests before I can perfor,m them, it might take a few days, sorry, but really appreciate the help! I know Thunderfoot went to some work to come up with that set of tests.

I exhanged beds on the truck Monday and Tuesday.

My tardiness in responding has been that the web server here was causing an error message as follows, even with a different logon, error was:

You don't have per,mission to access /forum/posting.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

[fordman]

ill get back to you on this im to tired to night to study this it looks real easy though.

[rjewkes]

looks like your missing a wire on both connectors.

i didn't think theres an open one i could be wrong though.

[fordman]

noo the six way has a open hole for extras of some kind.

[rjewkes]

probabl for the cruise control hornpad.

[tboneshep]

Thunderfoot test as follows:

2. Turn the key on to "Run" position and check to see which pins now have power on them (Pin 44 should BLINK) This is the power for the turn signal from the turn blinker… There shouldn't be any power on any of the other wires at this time…

Pin 44 NO BLINk

But why does the left turn marker flash on the dash and externally?

3. Pin 810 Good
4. Pin 810 Flasher good

1. Connect this jumper from pin 810 (if it worked or you can use pin 44) and go to pin 3/50 and press on the brake peddle. The left front turn signal and the dash indicator should come on. (we know this one works so this is a good test of the procedure)

Good

2. Connect this jumper from pin 810 to pin 2/49 and press on the brake peddle. The right front turn signal and the dash indicator should come on.

NO Good for pin 810 to pin 2/49?

Could not verify test 3 & 4 by myself

So, does that mean there is a central failure to cab-side of the connector for the right turn, back/front?

[fordman]

44 is dash lights from what i remember. it was light blue, i think

[Thunderfoot]

44 is dash lights from what i remember. it was light blue, i think

No Pin 44 is from the turn signal flasher... we're only looking / working on the Turn signal connector on the column...

Pin 44 NO BLINk

But why does the left turn marker flash on the dash and externally?

This is ok as long as it "had power" on this pin... The blinker needs a decent load on it to make it blink so the test light by itself probably is not enough to make it blink... So as long as it made the test light "light" then you're good...

NO Good for pin 810 to pin 2/49?

So, does that mean there is a central failure to cab-side of the connector for the right turn, back/front?

This one is only for the right front... pin/wire 2 goes out to the front turn and 49 goes to the dash right turn indicator... I'm not sure where the 49 wire is connected to the 2 wire...

So yeah, there is a problem some where in the wire to the right front or a connection along the way...
If you can follow this wire color as much as you can it will should stay the same all the way out.
If you can, hook up this jumper and put something on the brake pedal to hold it on, and then check the wire/connection with the test light to see if you can find where the problem is...
Start right at the connector to be sure there is not a problem with the wire to the pin (seen that before)

At least we're narrowing it down