Ignition switch wire color help

[DirtDonk]

No. If this is your '77 there are two because one goes to the ignition coil, as normal for an EB. And the other goes to the more recently introduced Dura Spark ignition control module.

An earlier model Bronco, say '74 and earlier in some areas, would likely only have had the one wire, whereas later ones with Dura Spark could have had two.

As long as all the wires are going where they're intended, and doing what they're supposed to do, you're good.

Paul

 

[chuckji]

Actually the stock Ford switches did have power in both start and run for the ignition and voltage regulator circuits. Most aftermarket switches like in Speedrdr's switch likely don't.
Now, that's not to say they always worked that way. There are plenty of original Bronco switches that have failed to keep power in the START mode, but were never noted until tested, because the 12v booster setup of the "I" wire from the starter relay will mask that failure.
A properly working switch however should have power to the coil (and ignition module if electronic) in both RUN and START.

Can't say why the PO used ACC rather than IGN in Speed's case. Maybe the other contact gave him some kind of trouble, or maybe he wanted power in both perhaps, or maybe they just didn't know or care and stuck it wherever.
Since there is no ACC wire visible, like there should be on an EB, the PO could have been punting during the whole wiring process.

And speaking of which, did you ever find a larger gauge wire (would be Black w/green if you can see that?) with a factory molded-in ring terminal. It's a slightly larger gauge than all the others save perhaps the Yellow wire, but it should have been there somewhere. Might even have been two of them on a '77.

This is the '77, you're working on, correct?

Paul

Thanks Paul!
After reading your post I went back and took another look at the schematics (the scanned copies that float around this sit from time to time).
I see where the ignition power comes from now and went out to my truck to measure and confirm.
Thanks to you I learned something new today, instead of following my misguided assumptions.
This site is great and filled with kind people like you that are always willing to help out. Great community!

 

[DirtDonk]

Thanks Chuck! Now I hope whatever path that led you down does not lead to a big bottomless pit!;D

Paul