strogg
Watch out for this guy
- Joined
- Oct 31, 2020
- Messages
- 619
- Reaction Points
- 2,158
- Location
- North DFW
- Current Ride
- 2020 F250 Lariat Tremor
- Current Ride #2
- 2001 Ford Excursion, 2010 Ford Focus
I just finished up the high idle / SEIC mod on the truck. The third gen powerstroke wiring seems to be in line with the 2nd gen (2017-2019), so folks can presumably utilize the existing videos for those. For the updated documentation, you can reference the body builders layout book (https://fordbbas.com/publications) for your particular model year (thank you @Wanabxtrm). Technical information starts on page 110. The resistor table for both the 6.7 and the 7.3 can be found on page 121.
I did mine slightly differently than most others. For one, I didn’t create a “loop” for the resistor pack, but rather kept it cleaner by having the wires “touching tips.” Also, I didn’t use the pass-through wires. Those things are insanely difficult to get to. It was literally quicker and easier for me to run a wire through a driver side firewall grommet that I already installed. Of course, your own mileage may vary.
Here’s a quick rundown of how to do what I did.
I did mine slightly differently than most others. For one, I didn’t create a “loop” for the resistor pack, but rather kept it cleaner by having the wires “touching tips.” Also, I didn’t use the pass-through wires. Those things are insanely difficult to get to. It was literally quicker and easier for me to run a wire through a driver side firewall grommet that I already installed. Of course, your own mileage may vary.
Here’s a quick rundown of how to do what I did.
- Open the cover on the passenger side footwell to expose a fuse box.
- Tucked in there is a pigtail for the PTO harness. Unplug it and pull it out.
- Find wire 9 (PTO RPM, green) and wire 10 (DIESEL PTO REF, white/brown) and pull the shrink wrapped ends off both (green circle).
- Strip a little extra off one of the two, then trim each wire. We're making one wire longer than the other.
- Solder on a resistor to extend the shorter wire so the other end of the resistor meets up with the longer end. The manual calls for a 1 watt rated resistor, but if you know ohm’s law, you’ll understand even a 1/8 watt will suffice. Just make sure you get a good quality resistor. I used a resistor pack to make roughly 19KOhm because I didn’t have a single 20k resistor laying around.
- Heat shrink the two wires together, so it looks neat
- Take wire 7 (PTO 1, yellow/green) and solder an 18 gauge wire to it. Heat shrink to protect the joint. Make sure you use wire #7 and not #14. For some reason, Ford used yellow/green for both. (You want green check mark. Leave the red x alone)
- Run the wire to the upfitter relay box in the engine bay. If you choose to go through the driver side like I did, you can run the wire around the glove box, through the center console, then around the driver kick panel. You can easily stick a hand into the center console from the driver side to fish the wire out. Well, at least my bony hand could. If you can't, I'm sure your wife can.
- Solder the wire to whichever upfitter relay you want. I did switch 1.
- Put everything back together neatly.
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