High idle mod. Only 900rpms? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 14 (permalink) Old 01-25-2008, 04:37 PM Thread Starter
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High idle mod. Only 900rpms?

Hey guys, hooked up the correct wires(not the PTO wire) for the high idle mod and first time I hit the switch this morning it went up to around 1400rpms. I thought, "cool!". I've flicked the switch a few times since then and it only goes up to 900rmps. Has anyone had this happend to them before? I did the mod on my '05 and it always worked fabulously. Any thoughts?

Jeff
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post #2 of 14 (permalink) Old 01-25-2008, 05:33 PM
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Normal for BCP (battery charge protection). Stays high at first start because of the glowplugs and whatnot. After the truck is warmed up and the electrical load drops, it tops out at 900. The PTO wire will give you a solid 1200rpm. If you wanted more than that, you could use pto and a resistor on the wire that sets the pto-rpm and get all the way up to 2400, if I remember correctly.
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post #3 of 14 (permalink) Old 01-25-2008, 05:40 PM
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Here, this is from another forum that I had posted on a while ago. Might be useful over here for some people too.

:Thumbup:


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.

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. Here is a pic. I have both SEIC and BCP, just to try them both out.

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). 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).

Here is the pic...

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post #4 of 14 (permalink) Old 01-25-2008, 10:26 PM Thread Starter
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How do you pull the panel off? I didn't want it to break since it was about 30 degrees when I did this.
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post #5 of 14 (permalink) Old 01-25-2008, 11:04 PM Thread Starter
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Thanks for your help guys! I connected the PTO wire up and it works great!
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post #6 of 14 (permalink) Old 02-04-2009, 07:39 PM
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Takes about 5 min to do it guys! I hooked PTO to #4. Any chance there's a different wire to hook to the switch so you dont have to use the e-brake? I dont want to deal with resistors or any of that crap so if not, it's not a big deal.

But good advice for anyone looking to do this mod.
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post #7 of 14 (permalink) Old 02-04-2009, 08:57 PM
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yea im thinkin about doin this but would need a more instructional post

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post #8 of 14 (permalink) Old 02-04-2009, 09:14 PM
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there were some really good links and post that people had on this high idle mod. Like said earlier it only takes 5 min. i remeber having a bunch of printed paper telling me which wire was wich annd then spliced them and hooked them up. wish someone would post the link to the ford upfitter site.

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post #9 of 14 (permalink) Old 02-04-2009, 09:42 PM
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Quote:
Originally Posted by DieselFarmer View Post
there were some really good links and post that people had on this high idle mod. Like said earlier it only takes 5 min. i remeber having a bunch of printed paper telling me which wire was wich annd then spliced them and hooked them up. wish someone would post the link to the ford upfitter site.

This what you are talking about?

https://www.fleet.ford.com/truckbbas/non-html/Q162.pdf
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post #10 of 14 (permalink) Old 02-05-2009, 01:01 AM
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what are the advantages to the high idle mod?

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