Here is how I wired mine with a PMG starter, 4G Exp Alternator & factory cables. I eliminated the factory Bronco starter solenoid and switched to a solenoid out of a later truck, Explorer, whatever, that was factory EFI. I did that for 2 reasons....1, it is a cleaner and more compact for where I wanted to move it. 2, there is some disagreement out there if the newer type solenoid has diode?? protection for the EEC, preventing voltage spikes from reaching the EEC. I went with the idea that the newer solenoid does offer protection to the EEC, otherwise why did Ford change the solenoid on later year vehicles? I dunno....
Now, back to the wiring.....With moving the solenoid up next to the battery, mounted on the inner fender apron, I chose to shorten the factory Bronco harness, and only use what is necessary. My Bronco is a 69, not sure if other years are the same colors. If I remember correctly from 2011, I only used 4 wires from the Bronco harness, 2 heavier gauge power wires black & black w/ yellow stripe, green w/ red stripe, and red w/ blue stripe. The original brown wire that went to the other factory solenoid post was left in the loom and capped off.
1) The 2 heavier gauge wires(black & black w/ yellow stripe) are what powers everything inside the cab. You really only need to use one of them, but if you leave the other dangling, it will be live power just hanging there. If I understand correctly, those two wires are the "loop" that made the factory Ampmeter work. They looped thru the "loop" on the back side of the Ampmeter, which sensed how much the system was charging. These 2 can be seen in the pic, attached to the right side solenoid post at 12 o clock, after dropping out of the main loom. Both of them now have a fusible link downstream of the solenoid post.
2) Green with red stripe is the Alternator "excite" power, which turns the Alt on once running. I can't remember where it went initially, but mine is now connected to the same color wire on the factory Explorer alternator plug. The factory Explorer alternator plug has one more wire in it that is yellow w/ white stripe. The Explorer serp tech article mentions where to wire that into, and I think it's to battery voltage. I soldered mine up with the large charge wire where I connected factory fusible links from an Explorer. Green w/ red stripe wire can be seen in the pic dropping out of the main loom before the solenoid and running down the apron/inner fender seam where it joins all the other wires going to the engine, starter, & alternator. The heavy gauge Alt. charge wire(s) fusible link can be seen attaching to the right side solenoid post at 5 o clock.
3) The last of the 4 is the solenoid power wire which is red w/ blue stripe. That is key power to activate the solenoid which engages the starter. It's going to the single post on the solenoid at 11 o clock.
As you might recognize, I also used factory battery cables from a truck, not an Explorer, that are all pre-wired for PMG starter. That is what the other black rubber connector end cabling is coming off the bottom of the solenoid. That power harness, the ground cable harness with 3 ground points(engine, body & frame), and the Alternator wiring pass across the inner fender where it meets the battery tray on their way to the starter, engine, and alternator. The body ground can be seen attached to the upper mounting screw for the solenoid, where I tied in a few other important grounds by soldering all of them together.
I'm sure there are other ways to wire it all up, but take your time and once you know which wire is what, it's pretty easy. I was not sure at first, but the more I studied & understood it all, it became easy and made logical sense.
