Thanks so much, Vincent!

 

Don't apologize, none of us came out of the womb knowing this stuff.

If you don't understand something, ask and somebody will help you - but please keep it in bite-size chunks.

 

Thanks! I will try to keep my questions to the point.

 

Appreciate it, Festus!

 

There is a diode that looks exactly like this but is far removed from the bulk of wire in the harness. It's close to my Power Steering pump.

It comes from the fuel relay switch and connects to 10 wires.

- 2 wires (tan) run clear across the front of the engine to the passenger side of the vehicle and connect to a large plug that has two yellow wires coming from it's end. They run to the inertia switch.

- 1 green wire runs to the coil

- 1 green/white stripe wire runs back to the ECM

- 1 brown or black wire/pink stripe runs to the solenoid - there are 4 seperate wires that are attached to it. They are: 1 wire that runs to a resistor, one that runs to the coil, 1 that ones to the fuel relay, and one that runs to the ECM.

- 1 red wire (can't ell if there's a stripe or other coors) runs to ECM

- 1 red wire that runs to the TFI (I have that mounted remotely in a heat sink to get it away from the heat.

- 1 tan wire that appears to run back to the ECM

- 1 yellow wire that runs to the solenoid.

- 1 wire that runs to the oil temp sensor.

Is your posting intended as an example of a diode OR is this the diode all are referring to?

There is presently no diode connected to any wire that run to the IAC.

 

It is an example of the diode Ford used in 1985. The one in the photos is the diode around the IAC in the 1986 Ford that I took the photo of.
I was thinking the two wires you have at that point is just a junction and is a source for the other red wire but it may have another source also before it gets back to the ECM Power relay.

 

I thought so but wanted to be certain.

I have read that the later models (not sure when it started) had the diode in the connector to the IAC. That's not the case for my Ford.

Thanks for the example. I am following the advice of several here: I will do the test for the diode as recommended by NotEnoughTrucks2014 (although I am 100% certain it is not there), I will follow ctubutus's information and advice in tracking the correct wires to the correct position on the ECM connector (already done but will do again), and will get assistance from Vincent when I get the diode so that I connect it correctly.

Again, the amount of useful knowledge offered me is invaluable. I fully realize that if I were to have to pay for that at a dealership, it'd cost me a boatload. So I do not take the help I get here lightly.

Steve

 

I did edit the post in post number 306.

 

Here is my picture of a diode/resistor combination from a 90s F150 but I have no idea from which circuit it came.

 

That's nice of you to say, Steve, thank you.

 

Steve, did you ever answer my question about the resistance readings on pins 46 & 48. What were the readings? "nothing" is not a result of a resistance check unless you meant no resistance, but your meter would have had a reading for these pins.

Reference; Thread # 177

 

Hello Vincent!

Yes. I got a reading of 1.

 

Steve, I know you looked at this wire earlier, but did you see a connector on that wire? Clean it? (Bro-Dave's connector is about 10" from the Neg. Battery Terminal)

 

That's not good......

When you set your meter to Rx200, what does your display show? And what does your meter show when you then touch the meter leads together?

 

I actually got rid of the connector and replaced it. It appears to be a good, solid ground.

So, if I wanted to check it for continuity, I would disconnect it from the battery, use the paper clip method and put that into the correct slot in the ECM connector, put the positive lead at the other end and ground the negative lead, Correct?