We went over this a month or two ago, but I can't remember the details. I think you are correct, those are the plugs. Can you make out the colors of the wires to each plug. I don't have time right this minute, but here are the two diagrams, you have the 4.9 EEC and you want to go to duraspark II. I checked off the connectors and their wire colors, I want to say they will plug in but it needs to be verified again first by the diagrams below.

 

Ok, I have a little bit of time here before I leave. I see connector c321 in both diagrams. It has a red/lightblue in both diagrams for a cranking or start signal.

c321 also has a white/lightblue that is a 12v ignition on signal for both systems.

 

c325 has a red/lightgreen wire that feeds the coil on both systems. Someone check me, I don't see much else there so far.

 

I will get the wire colors on mine in the morning when I have more light to see with. The salvage yard guy said this swap was a pretty popular one, as he had just the one truck that had the set up still in it that I bought today

 

Here are the wire colors on the plugs on my '84, they're badly faded so I did the best I could

4 prong plug harness side:
White/red stripe
Red
Black/pink stripe
Red/yellow hash marks

3 prong plug harness side:
Red/light blue stripe
Tan/ light blue hash marks
Tan
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~
4 prong plug firewall side
Red/Yellow stripe
Red/grey stripe (may be green was badly faded)
Red/white stripe
White

3 prong plug firewall side
White/light blue stripe
White
Red/tan stripe

 

There are several "How To" s in the Stickies for the Conversion to DSII

Link => HOWTO - DSII Conversion (swap from TFI or EECIII / EECIV to DSII)

 

I saw those, wish they had photos, but I think I can make use of them

 

I am almost positive this will be plug and play. Not 100% though, I have never done it myself. But if you print that duraspark II schematic out, and see which color wires are shown on each side of the connectors in the schematic and the plugs themselves, it think it will work out. I would think Ford would have made it easy on themselves to run the trucks down the assembly line back to back,, with the different ignition systems just plugging in.

 

It was plug n play on my 86 other than coil connector. You can use the original coil if you want (save old coil-to-cap wire!)

 

That makes sense, the duraspark II coil is round, the TFI takes the square coil. I like keeping the system original, I am a proponent of the round coil with the duraspark system.

 

I have a brand new Duraspark II coil I saved from my last truck so I should have all I need. Once I get the DS II system working I can yank out the computer harness, and toss the computer in the trash. I will be glad when I get it done, the cobbled up EEC-IV it has now making the truck run like total crap

 

You're almost there--hardest part is stabbing in the new distributor. Remember to connect vacuum advance to port on carb.

 

Wiring harness on my '84 F150, Top 2 plugs go into the DS II module?

 

Think so. Basically you are connecting the coil and distributor and temp/oil gauges. Disconnect the old coil, distributor and oil/temp gauges from the rest of the wiring first to get them out of the way and simply reconnect. It really is plug and play.

 

I went ahead and bought a brand new module, as the one a friend gave me had the black epoxy on the underside showing signs of running down the sides