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I think Jim wins the prize - the wiring appears to have been hacked where the shrink tubing was as that doesn't look like the connector described in the schematics. (The groove around it was made by my knife, and that plastic is one piece.) On the other had, that's the best "hack" I've seen as the wires either side are the right length and it was in the middle of a bundle of wires under what looked like a factory tape job.
On the good-news side, I have another wiring harness that does have some red/yellow wiring in it. If it is long enough I'll connect right where that connector is and make a loop out to the oil pressure switch and back. Also, I'll tap into it to run the choke's heater, which shouldn't be a problem since the EVTM shows that in addition to the fuel pump relay's coil that fuse originally supported two carb bowl vent solenoids, a throttle position solenoid, a decel throttle kicker solenoid, as well as the brake warning light and seatbelt/headlight buzzer. So, when I'm done it'll support the fuel pump relay's coil, the choke heater, the brake warning light, and the seatbelt/headlight buzzer. No prob for a 15a fuse. And, that way the choke will only be heated when the engine is running. And, it'll be a neat installation as the choke and the switch are quite close.
Sounds good! BTW, I believe the center terminal on that switch was for the "idiot" light, you could stick a red LED in the oil pressure gauge and use it like Chrysler did, my LeBaron has both a gauge and light.
I've actually thought about installing an idiot light in place of the factory oil pressure gauge. I have the light and it would go directly where the gauge goes. Or, I could put a light in the warning lights above.
But, you are right that the switch has both a NO and a NC contact, so it could easily power a warning light. In fact, looking at the 1981 EVTM I see that the oil pressure warning light was fed by the .........wait for it............... red/yellow hash wire.
Hmmm, I also just realized that the 1986 EVTM doesn't seem to show an oil pressure warning light nor a charge warning light, although the 1981 EVTM does. So, did gauges become standard? If so, when?
Probably did become standard, although a charge warning light would be better than the ammeter. the later dash system has charge (battery) and voltmeter.
Whilst digging in boxes for Chrysler stuff, I found something you might have a use for:
Fuel pump relay and harness.
Then I discovered this in the same box:
May or may not fit Big Blue.
I then went looking for the rest, inertia switch and harness went to Matt when he was fighting with his 86 F-150 and found this piece, it is too long for Big Blue as it is for a 168" wheelbase so will need the front portion shortened or rolled up 35" worth.
Bill - I do need to tell you that Jim has shipped me a trailer harness, but if you aren't going to use the trailer harness I'd compare the two and use the better one. So, if you are going to send other things I'd like that one as well.
Anyway, I needed to move Big Blue out of the shop today and he wouldn't crank. Luckily the clutch switch isn't being used so I can easily jumper the solenoid and it started immediately. And, it did it again later when I moved it again. So, maybe it is now consistently failing? Hope so, as it'll be much easier to find that way.
Given that, once I'm done with Rusty I'll be working on the starter circuit instead of the fuel pump circuit. So, I have time to wait on the FPR harness to come in.
Well, I'm done with Rusty as a guy is coming to get him on Saturday. So, I'm troubleshooting Big Blue's reluctance to start. It was a very firm "ain't gonna happen" so I had visions of finding "it".
Put the test light on the red/light blue wire at the solenoid and got nothing. Then I looked at the Start & Ignition schematic on the 1986 EVTM and see a C-121 that the wire goes through before going to the clutch switch. And, looking at the 1985 EVTM in hardcopy I see the same thing. But, looking at the 1985 wiring schematics themselves I find the same connector is called C-306. Anyway, it is as shown on Page 14 here, and is right below the brake booster, as shown below.
And, sure enough, by moving the connector to get the pic everything now worked. So, I pulled the connector apart and checked both ways. One side does go to the solenoid, but the other side doesn't get power in Start, so something has changed again - apparently while pulling the connectors apart. Looks like I'm onto something.
Gotta quit for today, but tomorrow I hope to find that pesky thing!
[QUOTE=Gary Lewis;17037795]And, sure enough, by moving the connector to get the pic everything now worked. So, I pulled the connector apart and checked both ways. One side does go to the solenoid, but the other side doesn't get power in Start, so something has changed again - apparently while pulling the connectors apart. Looks like I'm onto something. QUOTE]
Finagle's Law of Dynamic Negatives, also known as Melody's law or Finagle's corollary to Murphy's law.
As for onion layers, I suspect I have several more. But the start and fuel pump circuits are high on the list. Then there's the fuel pump plumbing, and the fuel gauge, and.....
As for onion layers, I suspect I have several more. But the start and fuel pump circuits are high on the list. Then there's the fuel pump plumbing, and the fuel gauge, and.....
So, I pulled the connector apart and checked both ways. One side does go to the solenoid, but the other side doesn't get power in Start, so something has changed again - apparently while pulling the connectors apart. Looks like I'm onto something. 
