Mark

Sealing plugs don't really do much inside the pressure vessel. Especially, up front in the electronics compartment where there should be little to no water or hydraulic fluid.

We plug the holes that don't have wires, but they aren't needed for safe operation of an aircraft.

If I change a plug with ten unused pins, but they only supplied five plastic plugs.... I'll install what I've got and move on. 

Those are plastic sealing plugs to keep liquids out. They are installed at the rear of the plug in the pins slots that are not used.
  
     
 

You have 12 wires with two ends each... 12 more pins are required. I don't know if that's Boeing's job or the individual carrier, but they have to be there to complete the job.

12 wires total. The pins called out are "only" for the plug on the right.

The other side of the wire group goes to different type plugs (which might have different pins).

Those pins must be identified in the Standard Wiring Practices Manual.

I see three jacks and the left and one plug. I know they don't use the same pins.

They could be male or female. Larger or smaller diameter.....

This post:  Pins/Splices/Terminals     Might help you out.


Direct Link:  rotate.aero/images/Basics/Tools_Pins_Sockets_Term.pdf


 

Little 5 amp ones if I remember correctly.

Update: Uh.... it states fuse amperage right there in the image. 

Little 5 amp ones if I remember correctly.<br>
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 Assembly and Part Number
  
     
     

  
  
 

On the repair, we thought that we could just replace the wire in question. That was the wrong assumption.
You replace the the entire harness assembly from mid-strut down to the user systems (brake temp, wheel speed, and one gear tilt sensor).
  
     
  
Before tackling the job, I made up a by-pass jumper and connected directly from the #3 speed transducer to the J-Plug at the mid-strut level. Our voltage readings were correct.
  
     
  
Now..... the "fun" part of replacement.
  
     
     
     
  
Baked on carbon dust, Skydrol carbon dust, oil carbon dust..... you're covered, your tools are covered, clothes..... "not" the most pleasant job!!!
  
 

Troubleshooting a Anti-Skid issue which was faulting the #3 wheel.
  
  
We looked at the output of a functioning transducer vs. the faulted one. The drill being used only had two speeds (fast/slow), but it was able to show what our issue was.
  
     
     


A/C voltage should increase with speed. On the #7 wheel input, it did. On the #3, it "dropped" as we spun it faster.

Our problem? A high resistance short between both wires and shield of the twisted pair wire coming off the back of the transducer in the strut.
  
     
     
 

Pretty sweet! You're getting that 3D printing skill-set "rollin-on".