I said can, if everything works don't worry about it. I can look around the FSM to see what that wire does but you already did that. Its honestly hard to diagnose things like this over the internet. Sounds like everything was working until he wiggled the relay. I would start there checking the connectors and wiring leaading to that relay, along with the relay itself. That's where I would start if I was you. At night I would look at the FSM for your truck and the truck the dash came out of and figure out what those wires that are in different places and the ones that are missing do. You can always move the wires around to the correct pinouts. I will try to help you the best I can as I had to rewire basically my whole truck due to the previous owner.

 

We just looked at the wiring diagram from the FSM for 1998 and the pins match the replacement connector. There is no PK/RD wire. So I think moving pins around is out. We'll be heading back to the junkyard with the pin-out diagram to make sure we get the right one this time. I guess it is a transition year issue.

 

Don't do that yet dig deeper. Here is my best way to explain it, now just remember this is made up and not specific to your truck.
Let's say PK/RD wire is in pin #5 and controls dash lights.
Your factory plug may use GN in pin #8.
Just dig deeper

 

Is there an easy way to match the pin/wire color to the accessory that it runs? I had thought of going that route but I found it daunting to try and match the pin to the circuit. I felt like it would have to read through every dash related wiring diagram and map everything out. So, for example, how do I find out what the PK/RD wire runs which appears to be missing from the replacement connector?

I think what you're saying is that if I know RD/OR runs the high beams I would move it to pin 5 on the replacement. This would leave pin 35 empty on the replacement connector. And if, for example, pin 35 (which is supposed to be RD/PK on our truck) controls the right turn signal then find out what wire from the 98 FSM controls the right turn signal (maybe it's GN) and move it to pin 35. Am I understanding correctly? We would have to keep a note somewhere for future reference.

Also, how hard is it to get the pins out of the connector? Can I do it with some sort of combination of small screwdriver, pick and needle nose pliers? I see in the FSM there are special tools to get the pins out.

Thank you. I really appreciate the help on this.

 

In the service manual, there is a section that has connector pin-outs. Have a look there, it will tell you what each wire is, what it does, and what color it should be.

 

I have the pin outs. I'm in the process of mapping everything out in a spreadsheet. Looking at pin 5, for example, it shows circuit L3 with a 18 awg wire that is RD/OR. How do I find the wiring diagram for circuit L3 quickly? So far I've just been scrolling through the pages hoping to spot it.

 

Isn't there a chart that gives that info?

Otherwise, since it is a dash connector, look at the specific wiring diagram where that connector is. (probably on a couple.)

It used to be, that the entire vehicle wiring diagram was on one rather large page. (it would fold out a few times, and was even color coded) Wiring has gotten FAR to complicated for that though....

 

I'm sure there is something I'm missing. I just started learning auto diagnostics so wiring diagrams are still new to me.

 

Wiring/electrical issues are always great fun, even after you have been doing it for 40 plus years.

According to my diagrams, C134 should be black????

 

That's what I'm seeing in my FSM. However, looking at the pics in post 8 my connector is definitely not black.