OK well then it looks like the spare has to come down...

 

well I went out unplugged all plugs etc.. all looked good so I looked at my drivers tail light plug assembly and noticed there is another adapter that plugs into the harness that the bulb plugs into.. I had noticed this because I had a motorcycle that had an adapter like this.Anyways I took passengers side apart to investigate and compare. Ironicaly I unpluged adapter and will not work on passenger side? But I took the bulb that was originaly in the drivers side and installed in the passengers side and nok light? and this bulb looks great? But I put in an after market in the passengers side and it works.Also to my amasement I plugged the drivers side adapter into the passengers side and then it would not work????
So maybe just maybe it could be this adapter??????I dont know how to test this but I have tested all that I know and am frustrated

 

Well, I am really confused? I went to Ford and The parts manager let me try a brand new socket and it was a no go? I come back home to check pc and no replies yet to my issue? I can check with a test light without the bulb in the socket and system works per test light.But as soon as you plug in the bulb and check the prongs you get nothing on the test light????????? I am going crazy guys would this be a short circuit or a ground issue or what I can't seem to figure this one out............I have three wires going into the plug one is brake and the other is ground but what is the third???

 

I think the third wire is a turn signal? But as I was saying Would it be possible that when I plug bulb in That there not be a good enough ground between bulb and test light and system to light the test light bulb?????????

 

The Brake and the directional share the same filament. The tail light is the other light.
The 3rd is the ground. Get a good ground to the test light. Put the tail lights on and test for power., Turn the directional on and test for power, do the same for the brake light. Make sure that you shut off the previous "test" before going to the next one. If they check out ok at the socket then the ground is bad. If one of them dosent work then we'll have to chase it back from there.

 

OK Jim I test turn,It is good
I test tail, It works good
I test stop, no go? and this shares with turn so?
hazzards no? but this is the same as stop?
so like I said above I am puzzled is it power problem or ground?
With the bulb plugged in I get nothing on the test light, but with it unplugged I get the test light to light up? when I depress the brake pedal or hazzards. I think I am going to break out the multi meter and see what kind of voltage I get?

 

Use the multimeter and see the voltage. I'm still thinking ground though. If you know what wire is the ground you can test the theory by grounding it yourself.
Electrical gremlins are very tough to trace. I'm better at doing it them explaining.

 

Jim, I know what is ground and what is the power for the brake light...so I used two aligator clips,One clip on one side of bulb and to a good ground then the other to the other side of bulb and to power source,or brake light, and I get nothing?

SO LETS PUT ALL OF THE CONFUSING TALK OF THIS POST ASIDE AND START FROM SCRATCH,K.
#1 I was told I had a drivers side brake light not working yesterday.
#2 I purchace two new bulbs from Oreilly's
#3 I pull tail light assembly and pull the bulb and inspect,looked o.k.,Changed anyway and no light?
#4 I waited till today and removed again and pulled bulb and checked with a test light and found power because the test light was blinking with my hazzards on,this I thought pointed towards a ground.
#5 I noticed there was a socket adapter on the end of the plug that connects the main harness to the light bulb,so I removed passengers side and plugged into drivers side and did not work.then to rule out the plug I plugged in the drivers plug into the passengers side plug and did not work? So I THOUGHT that the adapter was bad.
#6 Went to ford and tried a brand new adapter and no go??????so I did'nt buy
#7 Come home take Drivers side apart again....turn on the hazzards and remove bulb use test light and power there....put bulb in socket and probe on the power source and there is no power on the test light????remove bulb and powerr??????
#8 I checked with my meter and get 12ish v with the hazzards on jumping of corse because I have nobody here to hold the pedal until after 3pm.
install bulb and no power with meter?????????? I am ok with electical but this has me wanting to take to someone else lol
#9 I took two sets of jumper wires and jumed from bulb to plug and nothing??????????????
#10 I guess I am going to take passengers side apart again and compare some other stuff......But this is where I am right now

 

[quote=megawatt00;7157395]If you know what wire is the ground you can test the theory by grounding it yourself. On the adapter it is stated major load, minor load, and ground.This is how I am positive I have the ground

 

the way I am reading this you have a left turn signal but no left brake light with turn signal off
that points to the turn signal switch

 

I went out and removed the passsengers side and swapped plugs and the plug worked this time? go figure but I still don't have drivers brake light......Also I noticed that the light from my test light is very bright on the ;passengers side and dimmer on the drivers side so that is what is making me point to power
?But where does the power come from? anyways maybe i need to remove the spare again and unplug again all of the plugs and check there for the brightness? I know on the trailer plug it is the same so maybe the plug that goes to the drivers side is just not making good enough contact????

 

Turn signal switch? on the colomn?how to check?I mean without tearing down the entire dash,lol

 

never had to get to it on this truck because never had to do it,but if you can find the plug that is where to check
you would back probe the plug and should have two brake light signals comming from it
the brake light signal goes through the signal switch and come back out split for left and right

 

The wires that control the blinkers the switch are 2 by there self. 1 is orange with a stripe,can't remember the other one. If you decide to take it apart. This is how I wired my signals in my mirrors.


quote=rblaine9000;7157863]Turn signal switch? on the colomn?how to check?I mean without tearing down the entire dash,lol[/quote]

 

[/quote]

yes one is orange and the other is green if I'm not mistaken but did u find this at the bottom of the colomn or up the column at the switch?