Well, I just got done doing an injector swap, and installed the new SD valve cover gaskets along with them. So far, after initial start up, I can say that I'm pleased with them. I have to put some miles on them to be certain, but no problems yet. Figuring out the wiring was a bit of a headache, but once I figured out which wire was which for the truck harness and the new SD harness, it was simple.

From front to back, as the pigtail would be connected to the gasket, here's the order of the wires for the SD single connector: (passenger side)
1. #1 glow plug
2. #3 glow plug
3. #1 injector power
4. #3 injector power
5. Injector common ground (two wires splice into this from the truck harness)
6. #5 injector power
7. #7 injector power
8. #5 glow plug
9. #7 glow plug

Whereas, the truck harness with the two connectors is this (front to back):
1. #1 glow plug
2. #1 injector power
3. #1 and #3 injector ground
4. #3 injector power
5. #3 glow plug

1. #5 glow plug
2. #5 injector power
3. #5 and #7 injector ground
4. #7 injector power
5. #7 glow plug

I soldered in the new pigtails that came with the gaskets, and used rubber heat shrink.
One piece of advice I can give to anyone else who wants to do this, is crimp the injector clips down before you install the gaskets. They went on my injectors really loosely, so I took a pliers and crimped them down to make them hold a little more securely.

So for now, I'm happy with the way they turned out. They were cheap ($50 a piece), the inside harness is integral to the gasket (no extra clip-on connection like the stock SD harnesses, so no need for the $.50 mod) and they came with a new pigtail. I'll keep everyone updated on them as I get more miles on my truck.

 

Good job and thanks for the update. Last month I went the same route except did the Dorman OBS style which, like yours, the inside harness is integral to the gasket. Guess time will tell which is better.

 

I had already burned up and replaced one of the external connectors on my truck, so I didn't trust the rest not to burn up as well. That's why I went with the SD style. I needed new pigtails anyway.

 

What make the SD pigtails better?

 

Bigger gauge wire

 

Yeah, that and there's only 2 SD pigtails instead of the 4 on an OBS. I'm glad I decided to replace them, too. The wires on the old pigtails were so soaked with oil and age that they were getting gooey. But cut them back about 4"-6" and the wires were nice and tight again.

 

On the gp's only. The injector wires are the same size.

 

The UVCH wire is bigger?
How about the wires that feed them outside the valve cover, what size are they in comparison?

 

I don't remember if the uvch gp wires are bigger or not, I think so, but I know the outer ones are. I think they are just the next gauge bigger, possibly 2 sizes.

 

What good is that? You would be splicing into a smaller wire(original harness) to feed a larger wire(new pigtails)

 

Remember the real problem lies with the pins not the wires in the obs harness the pins in the sd pigtail is larger and the pins for the injectors are the same obs and Nbs

 

What is wrong with the OBS pins?

 

They burn up inside the connector every pin I have pulled out of a burnt connector had the same symptom the spring inside the pin lost its tension due to the heat of the amps passing thru

 

Good to know. Mine are still good at 160k and I have all the service records since the truck was new and no record of any GP repairs. But I am starring to throw CEL for one GP bank

 

The OEM (Ford) UVCH and pigtail is probably a superior product. The reason I say this is due to the design of the pins themselves. The ford pins are actually flat like this underline _ where the Dorman pins are round like this period . The flat pins have more surface area and can withstand a greater current capacity and heat cycles over time.

The only problem with OEM design is the additional inner harness connections and of course cost. I don't know if the Dorman 9 pin harness utilizes the flat or round pin style but I do know the Dorman 5 pin harnesses do use the round pin style, since recently I just replaced mine. This was simply due to availability and cost at the time.