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Even though the colors for the backup lamps don't match, there is in fact a second backup lamp circuit for the camper backup lamps. So I think we're still on to something.
And even though there is that second Red w/blue wire on the lower half, it does appear that for '77 the ignition control module gets it's START signal from that connector. Seems consistent then. So far..
If the connector actually fits together with no trouble, like it looks to be doing in your pic, then most likely this is all correct except for the colors. But that would not be the first time we've seen an inconsistent color on part of a circuit.
Do that testing described previously and let us know the results.
Sorry i dont know how to break down things into smaller quotes.
Yes, the top part it coming from NSS switch. The bottom is the other part of NSS and it goes to the main wiring harness. I just happened to find it in a box that came with the truck.
No dura spark, I went to one wire alt and all in one dist.
This is wiring up to the universal wiring kit I got from Speedway motors. So it more geared towards GM, not ford.
I will run out right now and check the wires with the test light.
Gotcha. As soon as you said it's the leftover from the old harness I realized there wasn't going to be an easy test!
But here's a basic breakdown of what I think I know so far. For the rest you're going to have to find the proper wires from the new harness, if they exist.
On the Red w/blue wires from the last pic:
1a. You can tie them both together where you splice them into the new harness, or:
1b. You can cut one of them off, or:
1c. You can just leave one of them unused for a future purpose. Just be sure to cap off the end.
1d. From the new harness you will find the Purple/Violet wire (START signal) from the key and attach it to the end with the double.
1e. The other half of the Purple wire will attach to the single Red w/blue wire and run from there to the "S" post of the starter relay.
On the seemingly Brown w/black wires (that are actually Black w/red):
2a. White w/black wire can be cut off or capped and tied out out of the way just like the second Red w/blue wire above.
2b. From the new harness find the power to the backup lamps (does it have one?) and connect to the Brown wire that has the White w/black wire sharing the terminal.
2c. From the remaining Brown wire (the one with the exposed conductor pin) run that out to your backup lamps.
Should work fine this way, as long as your new harness has a backup lamp circuit. If not, find an accessory circuit that is either unused or that you can tap into, and use that.
Gotcha. As soon as you said it's the leftover from the old harness I realized there wasn't going to be an easy test!
But here's a basic breakdown of what I think I know so far. For the rest you're going to have to find the proper wires from the new harness, if they exist.
On the Red w/blue wires from the last pic:
1a. You can tie them both together where you splice them into the new harness, or:
1b. You can cut one of them off, or:
1c. You can just leave one of them unused for a future purpose. Just be sure to cap off the end.
1d. From the new harness you will find the Purple/Violet wire (START signal) from the key and attach it to the end with the double.
1e. The other half of the Purple wire will attach to the single Red w/blue wire and run from there to the "S" post of the starter relay.
On the seemingly Brown w/black wires (that are actually Black w/red):
2a. White w/black wire can be cut off or capped and tied out out of the way just like the second Red w/blue wire above.
2b. From the new harness find the power to the backup lamps (does it have one?) and connect to the Brown wire that has the White w/black wire sharing the terminal.
2c. From the remaining Brown wire (the one with the exposed conductor pin) run that out to your backup lamps.
Should work fine this way, as long as your new harness has a backup lamp circuit. If not, find an accessory circuit that is either unused or that you can tap into, and use that.
Paul
Cool, I think I'm on the same page as to what your saying.
So 2b , is that a constant 12v to that Brown wire for the back up lights?
If so , than it should be the only wire with 12v except the 1d and 1e wires when you turn the key to start it, correct?
I'll work on this over the next couple of days and get back with you.
Thank you for your help!!
The backup lamps won't be "constant" voltage in this case. They're always from the "switched" side of things. Up to you actually, but in 99% of the cases you want them operated with the key only, so you don't accidentally leave them on sometime when you park with the lever in Reverse or the NSS out of adjustment.
It's not really much of a deal with an automatic trans as it would be if you had a manual trans and liked to park with it in gear or reverse as a habit. But it might still be a thing, so I would personally only use switched power for 2b.
Yes to your next question. The backup lamps will be the only one powered up (but with the key on) except in START, when the Purple/Red w/blue wire will be the only one powered.
I say the only one, because in most cases the ignition switch will disconnect the keyed accessories when the starter is cranking.
So to sum up, the backup lamp wires are the only ones powered up with the key ON and the neutral-safety/starter relay wires are the only ones powered up in START.
Correct. They have the two separate functions, with different positions.
When in reverse it closes the contacts on the Red w/black wires and when in park or neutral it closes the contacts for the starter relay wire.
Does your harness already have a dedicated backup lamp wire? Or do you have to add that yourself?
Sorry I forgot, but did you say which harness you bought?
Paul
I have a dedicated back up light power wire and i have a separate dedicated back up light wire.
When hooked up this way back up lights are always on.
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