Aux switches

Discussion in '6.4L PowerStroke Power & Performance' started by tom engle, Jan 8, 2014.

  1. tom engle

    tom engle SDD Junior Member

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    Last week I purchased a 2008 Ford F350 dually.

    Today while parked, I accidently turned on the 3d Aux switch and the engine reved up to over a 1000 rpm. I have no idea what is connected to this switch. None of the other 3 switches do anything.

    Any ideas or how I could find out?

    Thanks!

    Tom
     
  2. BIG JOE

    BIG JOE Full Access Member

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    Sounds like the PO installed the SEIC (Stationary Engine Idle Control) option, for whatever reasons. You may find it to be a purdy handy.. for things like: Jump Starting another vehicle, increased A/C while caught in traffic.. and the like.

    Check your Owners Manual for the Aux switch (Upfitter Switches) wiring location to see if there's any wiring additions, and what they control. Any Added lighting on this new to you 350, or anything like that ?

    Joe

    You can go to www.fleet.ford.com and learn a lot more too ?
     
    Last edited: Jan 8, 2014
  3. tom engle

    tom engle SDD Junior Member

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    Thanks Big Joe for the quick response. I am going to have to get under the dash and see what else I can find. There is a small potentiometer installed under the steering wheel that I am trying to figure out too......mystery mods.
     
  4. BIG JOE

    BIG JOE Full Access Member

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    In Park, Park brake set..Flip the aux 3 switch.. and turn the knob on that potentiometer.. bet yul find that it controls the idle RPM's.

    Joe
     
  5. WD40

    WD40 Full Access Member

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    I love the high idle on my 06 and use it all the time.
    Doug
     
  6. tom engle

    tom engle SDD Junior Member

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    You Sir were EXACTLY right! It allows the RPMs to rev from 1200 to 2200 RPM using the potentiometer.

    Couldnt find switches 1,2 & 4 connected to anything. It has only the stock lighting installed.
     
  7. BIG JOE

    BIG JOE Full Access Member

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    ;tu ;)

    Yul find the high(er) idle to be real handy (like WD sez), now that you know it's there for ya. Times like I mentioned before.. stuck in traffic, a Jump Start...... And as with any extened idleing times.. a few more R's is better/best on Dezel engines.

    Those Aux switches Are... a nice feature on these trucks. Nice of FOMOCO to have switches available.. Built in.

    Hang around here long enough.. yul be add'n stuff. :sly:)

    Joe
     
    Last edited: Jan 12, 2014
  8. tom engle

    tom engle SDD Junior Member

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    Im going to be pulling a 38' Heartland Big Country 5r with mine. I had an older Chevy C3500 but it just wasnt up to the task. Having the fifth wheel hitch re-installed next week, but wont be moving the trailer until March. We full time and are in the San Antonio Texas area for the Winter.
     
  9. BIG JOE

    BIG JOE Full Access Member

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    San Antone is a good place to hunker down. We've stayed at the Lakeland AF Base RV park.. acouple'a times. Lots to see around that area. ;tu

    I'd bet yul find that F-350 DRW will Really make a Dif pulling yer 5r. Lotsa low end grunt. It'll make you grin.

    Joe
     
  10. WD40

    WD40 Full Access Member

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    There are some real nice camp grounds in and around San Antone, we love it there. We like to spend 2 or 3 days there coming home from The Valley.
    Post up a few pictures of your truck and trailer.
    Doug
     

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