Need to post a question for you excursion guys. I'm usually only on the 6.0 diesel forum, but I have looked back through the Ex files and do not see any listing for it. I did the high idle mod on my F-350 several years ago and love it. I was planning on installing it on an 05 ex with 6.0 at work only to find that the needed wires for the mod were not in the Ex wiring harness. After some phone calls I was told that it could not be done on the Ex as it has a different harness even with the diesel. If anyone on here has done it please let me know.

 

That is a nice mod. My brother did it to his '05 F-350. I would also be interested in doing this mod for my 2000 7.3 if it has been done by anyone.

 

Had mine done by Jody on my DP Tuner....

Not a DIY mod mind you...

 

I realize this post is a little late perhaps, but I did the mod to my 2004 Excursion Limited 4x4 a year and a half ago. The EX was not fitted with the upfitter or upcountry or whatever it's called wiring harness under the dash, but the computer is still programmed for it. To do the mod on the EX, I was able (with the help of this forum) to pull the computer and identify the correct pin on the computer harness which, when +12V is applied, changes the idle to 1200RPM. I soldered a wire lead to the computer pin, drilled a tiny hole through the wiring harness plug at the pin location, poked the soldered wire through the harness and silicone sealed to prevent water from leaking into the harness. I ran the wire through the firewall to a lit switch on the dash, which receives the +12V from the dash mounted Power Outlet circuit. The switch is grounded underneath the dash, and the light on the switch activates when power is being sent to the computer through the switch.

It works great. In my work, I often have to have the truck idle sometimes for hours with lights, strobes and AC running + a power inverter for computer equipment, and the high idle keeps the EGT temps in the correct range and the battery charged an the AC Frosty!

 

This is from "a different" site, but the only write-up I've really seen-

I've done it to my 05 6.0l Ex and it Works
I've pasted my post from another forum about how to do it.
PM me if you have any questions
All you late model Excusion owners can have SEIC (Stationary Elevated Idle Control) and it will only cost you $5.95 and about two hours of your time
(one hour schmoozing your local dealer technician) Here's a brief description.
I highly reccomend if you're not up on the SEIC mod that you shoud do a search and check the tech sections so that you are up to speed with the modification.
Just because this works on my 2005 Excursion 6.0 PSD I have no idea if it will work on yours.
I cannot be held responsable for any oops I just fried what ever.
1)Visit your local dealer with a dozen Dunkin dounuts, and ask the service manager if they have any warrantied PCM hanesses they could cannabilize for you.
(you need one female terminal with wire 2 feet long, any color)
2)Go ahead and install your toggle or I prefer the round rocker switch. The switch will need to be connected to an ignition hot source. Connect the other side of the switch to one of the customer access firewall pass through wires.
3) Remove the drivers side battery cables, battery shield and battery.
4) This will give you access to the PCM. Next you need to remove one of the three PCM connectors. the one you want is the one closest to the fire wall ( connector #C1381a ) To remove the connector push the grey lever on the top of the connector towards the passenger side of the vehical.
5) Once you have the connector removed disassemble the black shroud from the back of the connector to do this gently release the four barbed tabs with a scratch pick and remove the cover.
6) Load a 9/64 bit in your drill, hold the connector horizonally in your left hand, locate the empty socket on the right hand vertical row of sockets, second from the top this is socket # 12. GENTLY drill the socket out ( the back of my connector had some plastic "flash" in it preventing the socket from fitting into the connector.
7) Get out your trusty Hot Melt Glue Gun and pre heat it.
8) Insert the socket salvaged from you local dealer into the back of the connector, oriented the same as the other sockets in that vertical row.
Hot melt glue the socket in place from the back side (the side with the wire)
9) Once the glue dries reinstall the black shroud to the connector, tie wrap your new wire to that connectors bundle and route it towards the firewall
(I fished mine through a new split loom in place already that I had run for my driving lights)
10) Connect your new wire to which ever through the firewall wire you're using.
11) Re-connect the PCM connector to the PCM. To do this gently push the connector on the socket, Hold your mouth just right and wiggle and jiggle the grey lever until it pulls the connector home and snaps in place.
12) Reinstall your battery, shield and cables.
13) Ready to test.
Vehical in park, parking brake set, no feet on either the service brake or the throttle. toggle switch off. Start your engine, flip your toggle switch and your engine will idle up to 1200 rpm.
14) You can quit grinning now!

If it helps, great.

 

I posted my Excursion High Idle mod in the Excursion and in the 6.0 forum. Here's the link.....

https://www.ford-trucks.com/forums/1...-not-easy.html

 

Anyone done it on a 7.3 Ex ??

 

Thanks to everyone for your replies. I see that the high idle mod can be done, although not as easily as on a SD. We have replaced the OE alternator last year with a 200 amp alternator and it has helped, but I believe the High Idle Mod will be the answer. Again, Thanks for digging up an answer for my problem, I knew that if it could be done that someone on this site had done it.