6.4 High Idle Wiring - Diesel Forum

dswift · 10-06-2007, 01:02 PM

Ok, I need some brain power here.
I just purchased the '08 and want to do the fast idle upgrade.
I helped a friend do it to his '07.
Is the wiring color codes and procedures the same?

Thanks for the info!

2008screw · 10-06-2007, 02:43 PM

Here, I was givin this link

http://members.cox.net/richardray/Up..._Switches.html

dswift · 10-30-2007, 10:31 PM

Thanks for the link but I have an '08 and the wiring codes are different.

I got the Body Builders Advisory Service QVM Bulletin: Q-117-R1
Dated June 7th,2007 and it says to wire the Purple with Brown stripe wire to the upfitter switch for the SEIC.

This is suppose to send the rpm's to 1200 and then adjust accordingly for battery charging.
Except it doesn't go to 1200 it goes to about 900.
It almost acts like it's the PTO Wiring except the PTO wire is supposed to be the Yellow with Green stripe wire.
Does any body have an idea of what's up?
Thanks for any info!

ZeroOne · 10-31-2007, 12:33 AM

For PTO @ 1200rpm its a yellow/green wire. You just use a butt-splice and hook that wire to which ever upfitter you decide to use. Start the engine, parking brake applied, trans in park, and flip the upfitter. The engine will smoothly climb to the 1200rpm. It will NOT regen in PTO mode, or so the Ford document had stated.

PTO (the yellow/green wire), will idle to 1200rpm, but there is another wire you can add a resistor or potentiometer to, to change the "PTO" idle speed (all the way to 2400rpm I believe).

BCP is the purple/brown wire, and will hang at 900rpm and idle up from there depending on electrical load, (hence "BCP", Battery Charge Protect).

You pull off that panel below the steering wheel... the upfitter bundle and the add-on bundle are to the far left, above the parking brake mount, about 3 inches apart. I have a pic with both SEIC and BCP, just to try them both out.

Here is the pic...

http://img.photobucket.com/albums/v4...s/DSC05662.jpg

Kimminau2 · 10-31-2007, 01:06 AM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ZeroOne</div><div class="ubbcode-body">For PTO @ 1200rpm its a yellow/green wire. You just use a butt-splice and hook that wire to which ever upfitter you decide to use. Start the engine, parking brake applied, trans in park, and flip the upfitter. The engine will smoothly climb to the 1200rpm. It will NOT regen in PTO mode, or so the Ford document had stated.

PTO (the yellow/green wire), will idle to 1200rpm, but there is another wire you can add a resistor or potentiometer to, to change the "PTO" idle speed (all the way to 2400rpm I believe).

BCP is the purple/brown wire, and will hang at 900rpm and idle up from there depending on electrical load, (hence "BCP", Battery Charge Protect).

You pull off that panel below the steering wheel... the upfitter bundle and the add-on bundle are to the far left, above the parking brake mount, about 3 inches apart. I have a pic with both SEIC and BCP, just to try them both out.

Here is the pic...

http://img.photobucket.com/albums/v4...s/DSC05662.jpg </div></div>

Good post!

Captcaper · 10-31-2007, 01:41 AM

Good Post

Does anyone know if there are is wiring threw the firewall from the cab for add ons so we don't have to fish wires threw the firewall?

ZeroOne · 10-31-2007, 11:00 AM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Captcaper</div><div class="ubbcode-body">Good Post

Does anyone know if there are is wiring threw the firewall from the cab for add ons so we don't have to fish wires threw the firewall? </div></div>

There are 4 'pass-thru wires' blunt cut at both ends. The colors (2008 only) are Brown/White, White, White/Orange, Gray/Orange.

Check the post below for a link & pics. Page 4 has the pass thru info.

Stroked & Stoked · 10-31-2007, 11:31 AM

The Ford bulletin for highy idle complete with wiring diagrams and pictures of the wire locations is here

Kimminau2 · 10-31-2007, 11:32 AM

The upfitter wires are easy to find under the dash. I could not find them in the engine compartment. I thought they had stubbed a set thru the firewall.

Captcaper · 10-31-2007, 06:44 PM

thanks

Stroked & Stoked · 11-01-2007, 03:26 PM

The 4 blunt-cut pass-thru wires are found in the harness below the cowl, just outboard of the brake master cylinder. A picture is shown in the link that is in my post above

dswift · 11-01-2007, 06:21 PM

ZeroOne thanks for the response.
I have all that info from the Body Builder Bulletin and have it wired as such.
BUT, according to the instructions. In BCP wiring, it's supposed to go to 1200 rpms first! Then adjust accordingly for battery charge protection, which it doesn't do.
I guess they probably have the instructions wrong.
I did read in the owners manual that it's characteristics would change a little after the truck had broke in.

Bullmacks link has an updated Bulletin: Q-162 Revised July 16th.
It's description of how the SEIC responds in BCP mode for Gas engine is exactly how my truck reacts. Except my truck is Diesel!

I went to a local dealership Diesel and Ford rally the other day, and one of the tech's thought my truck's PCM needed flashed.
It's brand new with 1500 miles on it.

All I'm really trying to do, is run the truck at 1200 rpms to prevent stacking on long idles.
Like i could do with my '99 that I had an APCM in.

What do you guys think? Should I just wire the PTO mode and go that route?
Thanks for any reply, I'm getting ready to take a long trip and I want to have it done before I leave.

Stroked & Stoked · 11-01-2007, 07:14 PM

Doesn't the diesel schematic require a resistor be wired in? The bulletin has a chart showing various resistor values and the corresponding high idle.

Dennis

dswift · 11-01-2007, 08:07 PM

My understanding of the bulletin, is that adding the potentiometer is an option, not a requirement.
The PCM is already pre-programmed for a PTO or BCP setting.

I went back and read my first bulletin and it states the same thing as the revised.

Which is:> Minimum engine speed-Gas engine: 910 approximately. Gas engine has a 900 rpm "stand by" speed that it first goes to when SEIC is initiated to step it away from stall speed that it could dip to as PTO load is applied. This is an unusable speed for any application.

That's exactly what my truck does.
Just what I posted in my second post!
It goes to just above 900 rpms first, then adjusts after.
It's never gone over 1100. Of course I understand that it obviously didn't need any more than that for the current draw on the electrical system. And I do have the extra heavy duty alternator. But according to the Bulletin, if you have a diesel, and you wire for BCP. It's first supposed to climb to 1200 rpms.
Then adjust after that.
It's never done that!

ZeroOne · 11-01-2007, 11:47 PM

In my opinion, BCP at 1200rpm is a misprint. I've got both BCP and PTO hooked up. PTO always goes to 1200rpm (and would go higher given an optional resistor or potentiometer on that specific wire). BCP always goes to 900 EXCEPT if I do it when just starting the engine cold... I'm assuming the glow plugs and used-charge from starting make BCP go higher initially on cold starts. When warm, it never goes above 900, even if its just been started.

If you're looking for higher than 900rpm, and for it to be consistent, I would definitely use the PTO wire. It will always be at the rpm you want.

I also have an upgraded alternator (duals), so maybe those of us with more current capability will see slightly different RPM characteristics (while on BCP).